X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=gtk2_ardour%2Fardour_button.cc;h=56854880d851c69285d5008e4099cfc67c99c132;hb=cf52d6e4b40111eb04b244ec054055a4ec15dbe0;hp=6c35512e62f0bcd422267d72c12cd2d5340627ab;hpb=4efa0fd77c46694462c129c1071205ae71eadc3d;p=ardour.git

diff --git a/gtk2_ardour/ardour_button.cc b/gtk2_ardour/ardour_button.cc
index 6c35512e62..56854880d8 100644
--- a/gtk2_ardour/ardour_button.cc
+++ b/gtk2_ardour/ardour_button.cc
@@ -24,6 +24,7 @@
 #include <pangomm/layout.h>
 
 #include "pbd/compose.h"
+#include "pbd/controllable.h"
 #include "pbd/error.h"
 #include "pbd/stacktrace.h"
 
@@ -31,22 +32,23 @@
 #include "gtkmm2ext/rgb_macros.h"
 #include "gtkmm2ext/gui_thread.h"
 
-#include "ardour/rc_configuration.h" // for widget prelight preference
-
 #include "canvas/utils.h"
+#include "canvas/colors.h"
 
 #include "ardour_button.h"
-#include "ardour_ui.h"
-#include "global_signals.h"
+#include "tooltips.h"
+#include "ui_config.h"
 
-#include "i18n.h"
+#include "pbd/i18n.h"
 
-#define REFLECTION_HEIGHT 2
+#define BASELINESTRETCH (1.25)
+#define TRACKHEADERBTNW (3.10)
 
 using namespace Gdk;
 using namespace Gtk;
 using namespace Glib;
 using namespace PBD;
+using namespace ARDOUR_UI_UTILS;
 using std::max;
 using std::min;
 using namespace std;
@@ -57,11 +59,15 @@ ArdourButton::Element ArdourButton::just_led_default_elements = ArdourButton::El
 
 ArdourButton::ArdourButton (Element e)
 	: _elements (e)
+	, _icon (Gtkmm2ext::ArdourIcon::NoIcon)
 	, _tweaks (Tweaks (0))
+	, _char_pixel_width (0)
+	, _char_pixel_height (0)
+	, _char_avg_pixel_width (0)
 	, _text_width (0)
 	, _text_height (0)
-	, _diameter (11.0)
-	, _corner_radius (4.0)
+	, _diameter (0)
+	, _corner_radius (2.5)
 	, _corner_mask (0xf)
 	, _angle(0)
 	, _xalign(.5)
@@ -72,29 +78,37 @@ ArdourButton::ArdourButton (Element e)
 	, text_inactive_color(0)
 	, led_active_color(0)
 	, led_inactive_color(0)
+	, led_custom_color (0)
+	, use_custom_led_color (false)
 	, convex_pattern (0)
 	, concave_pattern (0)
 	, led_inset_pattern (0)
 	, _led_rect (0)
 	, _act_on_release (true)
 	, _led_left (false)
-	, _fixed_diameter (true)
 	, _distinct_led_click (false)
 	, _hovering (false)
 	, _focused (false)
 	, _fixed_colors_set (false)
 	, _fallthrough_to_parent (false)
+	, _layout_ellipsize_width (-1)
+	, _ellipsis (Pango::ELLIPSIZE_NONE)
+	, _update_colors (true)
+	, _pattern_height (0)
 {
-	ARDOUR_UI_UTILS::ColorsChanged.connect (sigc::mem_fun (*this, &ArdourButton::color_handler));
+	UIConfiguration::instance().ColorsChanged.connect (sigc::mem_fun (*this, &ArdourButton::color_handler));
 }
 
 ArdourButton::ArdourButton (const std::string& str, Element e)
 	: _elements (e)
 	, _tweaks (Tweaks (0))
+	, _char_pixel_width (0)
+	, _char_pixel_height (0)
+	, _char_avg_pixel_width (0)
 	, _text_width (0)
 	, _text_height (0)
-	, _diameter (11.0)
-	, _corner_radius (4.0)
+	, _diameter (0)
+	, _corner_radius (2.5)
 	, _corner_mask (0xf)
 	, _angle(0)
 	, _xalign(.5)
@@ -105,19 +119,27 @@ ArdourButton::ArdourButton (const std::string& str, Element e)
 	, text_inactive_color(0)
 	, led_active_color(0)
 	, led_inactive_color(0)
+	, led_custom_color (0)
+	, use_custom_led_color (false)
 	, convex_pattern (0)
 	, concave_pattern (0)
 	, led_inset_pattern (0)
 	, _led_rect (0)
 	, _act_on_release (true)
 	, _led_left (false)
-	, _fixed_diameter (true)
 	, _distinct_led_click (false)
 	, _hovering (false)
 	, _focused (false)
 	, _fixed_colors_set (false)
+	, _fallthrough_to_parent (false)
+	, _layout_ellipsize_width (-1)
+	, _ellipsis (Pango::ELLIPSIZE_NONE)
+	, _update_colors (true)
+	, _pattern_height (0)
 {
 	set_text (str);
+	UIConfiguration::instance().ColorsChanged.connect (sigc::mem_fun (*this, &ArdourButton::color_handler));
+	UIConfiguration::instance().DPIReset.connect (sigc::mem_fun (*this, &ArdourButton::on_name_changed));
 }
 
 ArdourButton::~ArdourButton()
@@ -127,44 +149,41 @@ ArdourButton::~ArdourButton()
 	if (convex_pattern) {
 		cairo_pattern_destroy (convex_pattern);
 	}
-	
+
 	if (concave_pattern) {
 		cairo_pattern_destroy (concave_pattern);
 	}
-	
+
 	if (led_inset_pattern) {
 		cairo_pattern_destroy (led_inset_pattern);
 	}
-
 }
 
 void
-ArdourButton::set_text (const std::string& str)
+ArdourButton::set_layout_font (const Pango::FontDescription& fd)
 {
-	_text = str;
-
-	if (!_layout && !_text.empty()) {
-		_layout = Pango::Layout::create (get_pango_context());
-	} 
-
+	ensure_layout ();
 	if (_layout) {
-		_layout->set_text (str);
+		_layout->set_font_description (fd);
+		queue_resize ();
 	}
-
-	queue_resize ();
 }
 
 void
-ArdourButton::set_markup (const std::string& str)
+ArdourButton::set_text (const std::string& str)
 {
+	if (_text == str) {
+		return;
+	}
 	_text = str;
-
-	if (!_layout) {
-		_layout = Pango::Layout::create (get_pango_context());
-	} 
-
-	_layout->set_markup (str);
-	queue_resize ();
+	if (!is_realized()) {
+		return;
+	}
+	ensure_layout ();
+	if (_layout && _layout->get_text() != _text) {
+		_layout->set_text (_text);
+		queue_resize ();
+	}
 }
 
 void
@@ -180,11 +199,31 @@ ArdourButton::set_alignment (const float xa, const float ya)
 	_yalign = ya;
 }
 
+
+/* TODO make this a dedicated function elsewhere.
+ *
+ * Option 1:
+ * virtual ArdourButton::render_vector_icon()
+ * ArdourIconButton::render_vector_icon
+ *
+ * Option 2:
+ * ARDOUR_UI_UTILS::render_vector_icon()
+ */
 void
 ArdourButton::render (cairo_t* cr, cairo_rectangle_t *)
 {
 	uint32_t text_color;
 	uint32_t led_color;
+
+	const float corner_radius = std::max(2.f, _corner_radius * UIConfiguration::instance().get_ui_scale());
+
+	if (_update_colors) {
+		set_colors ();
+	}
+	if (get_height() != _pattern_height) {
+		build_patterns ();
+	}
+
 	if ( active_state() == Gtkmm2ext::ExplicitActive ) {
 		text_color = text_active_color;
 		led_color = led_active_color;
@@ -192,7 +231,11 @@ ArdourButton::render (cairo_t* cr, cairo_rectangle_t *)
 		text_color = text_inactive_color;
 		led_color = led_inactive_color;
 	}
-	
+
+	if (use_custom_led_color) {
+		led_color = led_custom_color;
+	}
+
 	void (*rounded_function)(cairo_t*, double, double, double, double, double);
 
 	switch (_corner_mask) {
@@ -212,27 +255,16 @@ ArdourButton::render (cairo_t* cr, cairo_rectangle_t *)
 		rounded_function = Gtkmm2ext::rounded_rectangle;
 	}
 
-	if (!_fixed_diameter) {
-		_diameter = std::min (get_width(), get_height());
-	}
-
-#if 0 // clear background - "transparent" round corners
-	/* Alas, neither get_style()->get_bg nor get_parent()->get_style()->get_bg
-	 * does work for all places in ardour where a button is used.
-	 * gtk style are sadly inconsisent throughout ardour.
-	 * -> disabled for now.
-	 */
-	if (get_parent ()) {
-		Gdk::Color c = get_parent ()->get_style ()->get_bg (get_parent ()->get_state ());
-		CairoWidget::set_source_rgb_a (cr, c);
-		cairo_rectangle (cr, 0, 0, get_width(), get_height());
+	// draw edge (filling a rect underneath, rather than stroking a border on top, allows the corners to be lighter-weight.
+	if ((_elements & (Body|Edge)) == (Body|Edge)) {
+		rounded_function (cr, 0, 0, get_width(), get_height(), corner_radius + 1.5);
+		cairo_set_source_rgba (cr, 0, 0, 0, 1);
 		cairo_fill(cr);
 	}
-#endif
-	
+
 	// background fill
 	if ((_elements & Body)==Body) {
-		rounded_function (cr, 1, 1, get_width() - 2, get_height() - 2, _corner_radius);
+		rounded_function (cr, 1, 1, get_width() - 2, get_height() - 2, corner_radius);
 		if (active_state() == Gtkmm2ext::ImplicitActive && !((_elements & Indicator)==Indicator)) {
 			ArdourCanvas::set_source_rgba (cr, fill_inactive_color);
 			cairo_fill (cr);
@@ -247,97 +279,107 @@ ArdourButton::render (cairo_t* cr, cairo_rectangle_t *)
 		cairo_fill (cr);
 	}
 
+	// IMPLICIT ACTIVE: draw a border of the active color
+	if ((_elements & Body)==Body) {
+		if (active_state() == Gtkmm2ext::ImplicitActive && !((_elements & Indicator)==Indicator)) {
+			cairo_set_line_width (cr, 2.0);
+			rounded_function (cr, 2, 2, get_width() - 4, get_height() - 4, corner_radius-0.5);
+			ArdourCanvas::set_source_rgba (cr, fill_active_color);
+			cairo_stroke (cr);
+		}
+	}
+
 	//show the "convex" or "concave" gradient
-	if (!_flat_buttons) {
-		if ( active_state() == Gtkmm2ext::ExplicitActive && !((_elements & Indicator)==Indicator) ) {
+	if (!_flat_buttons && (_elements & Body)==Body) {
+		if ( active_state() == Gtkmm2ext::ExplicitActive && ( !((_elements & Indicator)==Indicator) || use_custom_led_color) ) {
 			//concave
 			cairo_set_source (cr, concave_pattern);
-			Gtkmm2ext::rounded_rectangle (cr, 1, 1, get_width() - 2, get_height() - 2, _corner_radius);
+			Gtkmm2ext::rounded_rectangle (cr, 1, 1, get_width() - 2, get_height() - 2, corner_radius);
 			cairo_fill (cr);
 		} else {
 			cairo_set_source (cr, convex_pattern);
-			Gtkmm2ext::rounded_rectangle (cr, 1, 1, get_width() - 2, get_height() - 2, _corner_radius);
+			Gtkmm2ext::rounded_rectangle (cr, 1, 1, get_width() - 2, get_height() - 2, corner_radius);
 			cairo_fill (cr);
 		}
 	}
 
-	// indicator border on top of gradient
-	if ((_elements & Body)==Body) {
-		if (active_state() == Gtkmm2ext::ImplicitActive && !((_elements & Indicator)==Indicator)) {
-			cairo_set_line_width (cr, 3.0);
-			rounded_function (cr, 1.5, 1.5, get_width() - 3, get_height() - 3, _corner_radius);
-			ArdourCanvas::set_source_rgba (cr, fill_active_color);
-			cairo_stroke (cr);
-		}
-	}
-
-	// draw edge
-	if ((_elements & (Body|Edge)) == (Body|Edge)) {
-		rounded_function (cr, .5, .5, get_width() - 1, get_height() - 1, _corner_radius);
-		cairo_set_source_rgba (cr, 0, 0, 0, 1);
-		cairo_set_line_width (cr, 1.0);
-		cairo_stroke(cr);
-	}
-
 	//Pixbuf, if any
 	if (_pixbuf) {
-
-		double x,y;
-		x = (get_width() - _pixbuf->get_width())/2.0;
-		y = (get_height() - _pixbuf->get_height())/2.0;
-
-		//if this is a DropDown with an icon, then we need to 
-		  //move the icon left slightly to accomomodate the arrow
-		if (((_elements & Menu)==Menu)) {
-			cairo_save (cr);
-			cairo_translate (cr, -8,0 );
+		double x = rint((get_width() - _pixbuf->get_width()) * .5);
+		const double y = rint((get_height() - _pixbuf->get_height()) * .5);
+#if 0 // DEBUG style (print on hover)
+		if (_hovering || (_elements & Inactive)) {
+			printf("%s: p:%dx%d (%dx%d)\n",
+					get_name().c_str(),
+					_pixbuf->get_width(), _pixbuf->get_height(),
+					get_width(), get_height());
+		}
+#endif
+		if (_elements & Menu) {
+			//if this is a DropDown with an icon, then we need to
+			//move the icon left slightly to accomomodate the arrow
+			x -= _diameter - 2;
 		}
-		
 		cairo_rectangle (cr, x, y, _pixbuf->get_width(), _pixbuf->get_height());
 		gdk_cairo_set_source_pixbuf (cr, _pixbuf->gobj(), x, y);
 		cairo_fill (cr);
-
-		//..and then return to our previous drawing position
-		if (((_elements & Menu)==Menu)) {
-			cairo_restore (cr);
-		}
 	}
-
-	int text_margin;
-	if (get_width() < 75) {
-		text_margin = 5;
-	} else {
-		text_margin = 10;
+	else /* VectorIcons are exclusive to Pixbuf Icons */
+	if (_elements & VectorIcon) {
+		Gtkmm2ext::ArdourIcon::render (cr, _icon, get_width(), get_height(), active_state(), text_color);
 	}
 
+	const int text_margin = char_pixel_width();
 	// Text, if any
-	if ( !_pixbuf && ((_elements & Text)==Text) && !_text.empty()) {
+	if (!_pixbuf && ((_elements & Text)==Text) && !_text.empty()) {
+		assert(_layout);
+#if 0 // DEBUG style (print on hover)
+		if (_hovering || (_elements & Inactive)) {
+			bool layout_font = true;
+			Pango::FontDescription fd = _layout->get_font_description();
+			if (fd.gobj() == NULL) {
+				layout_font = false;
+				fd = get_pango_context()->get_font_description();
+			}
+			printf("%s: f:%dx%d aw:%.3f bh:%.0f t:%dx%d (%dx%d) %s\"%s\"\n",
+					get_name().c_str(),
+					char_pixel_width(), char_pixel_height(), char_avg_pixel_width(),
+					ceil(char_pixel_height() * BASELINESTRETCH),
+					_text_width, _text_height,
+					get_width(), get_height(),
+					layout_font ? "L:" : "W:",
+					fd.to_string().c_str());
+		}
+#endif
 
 		cairo_save (cr);
-		cairo_rectangle (cr, 2, 1, get_width()-4, get_height()-2);
+		cairo_rectangle (cr, 2, 1, get_width() - 4, get_height() - 2);
 		cairo_clip(cr);
 
-		cairo_new_path (cr);	
+		cairo_new_path (cr);
 		ArdourCanvas::set_source_rgba (cr, text_color);
+		const double text_ypos = (get_height() - _text_height) * .5;
 
-		if ( (_elements & Menu) == Menu) {
-			cairo_move_to (cr, rint(text_margin), rint((get_height() - _text_height)/2.0));
+		if (_elements & Menu) {
+			// always left align (dropdown)
+			cairo_move_to (cr, text_margin, text_ypos);
 			pango_cairo_show_layout (cr, _layout->gobj());
 		} else if ( (_elements & Indicator)  == Indicator) {
+			// left/right align depending on LED position
 			if (_led_left) {
-				cairo_move_to (cr, rint(text_margin + _diameter + 4),rint((get_height() - _text_height)/2.0));
+				cairo_move_to (cr, text_margin + _diameter + .5 * char_pixel_width(), text_ypos);
 			} else {
-				cairo_move_to (cr, rint(text_margin), rint((get_height() - _text_height)/2.0));
+				cairo_move_to (cr, text_margin, text_ypos);
 			}
 			pango_cairo_show_layout (cr, _layout->gobj());
 		} else {
-			/* align text */
-
+			/* centered text otherwise */
 			double ww, wh;
 			double xa, ya;
 			ww = get_width();
 			wh = get_height();
-			cairo_save (cr); // TODO retain rotataion.. adj. LED,...
+
+			cairo_save (cr);
 			cairo_rotate(cr, _angle * M_PI / 180.0);
 			cairo_device_to_user(cr, &ww, &wh);
 			xa = (ww - _text_width) * _xalign;
@@ -347,11 +389,9 @@ ArdourButton::render (cairo_t* cr, cairo_rectangle_t *)
 			 * TODO this should be generalized incl rotation.
 			 * currently only 'user' of this API is meter_strip.cc
 			 */
-			if (_xalign < 0) xa = (ww * fabs(_xalign) + text_margin);
+			if (_xalign < 0) xa = ceil(.5 + (ww * fabs(_xalign) + text_margin));
 
-			// TODO honor left/right text_margin with min/max()
-
-			cairo_move_to (cr, rint(xa), rint(ya));
+			cairo_move_to (cr, xa, ya);
 			pango_cairo_update_layout(cr, _layout->gobj());
 			pango_cairo_show_layout (cr, _layout->gobj());
 			cairo_restore (cr);
@@ -360,108 +400,105 @@ ArdourButton::render (cairo_t* cr, cairo_rectangle_t *)
 	}
 
 	//Menu "triangle"
-	if (((_elements & Menu)==Menu)) {
-	
-		cairo_save (cr);
-
+	if (_elements & Menu) {
+		const float trih = ceil(_diameter * .5);
+		const float triw2 = ceil(.577 * _diameter * .5); // 1/sqrt(3) Equilateral triangle
 		//menu arrow
 		cairo_set_source_rgba (cr, 1, 1, 1, 0.4);
-		cairo_move_to(cr, get_width() - ((_diameter/2.0) + 6.0), get_height()/2.0 +_diameter/4);
-		cairo_rel_line_to(cr, -_diameter/2, -_diameter/2);
-		cairo_rel_line_to(cr, _diameter, 0);
+		cairo_move_to(cr, get_width() - triw2 - 3. , rint((get_height() + trih) * .5));
+		cairo_rel_line_to(cr, -triw2, -trih);
+		cairo_rel_line_to(cr, 2. * triw2, 0);
 		cairo_close_path(cr);
+
 		cairo_set_source_rgba (cr, 1, 1, 1, 0.4);
-		cairo_fill_preserve(cr);
+		cairo_fill(cr);
+
+		cairo_move_to(cr, get_width() - triw2 - 3 , rint((get_height() + trih) * .5));
+		cairo_rel_line_to(cr, .5 - triw2, .5 - trih);
+		cairo_rel_line_to(cr, 2. * triw2 - 1, 0);
+		cairo_close_path(cr);
 		cairo_set_source_rgba (cr, 0, 0, 0, 0.8);
-		cairo_set_line_width(cr, 0.5);
+		cairo_set_line_width(cr, 1);
 		cairo_stroke(cr);
-	
-		cairo_restore (cr);
 	}
-	
-	//Indicator LED
-	if (((_elements & Indicator)==Indicator)) {
-
-		/* move to the center of the indicator/led */
 
+	//Indicator LED
+	if (_elements & Indicator) {
 		cairo_save (cr);
 
+		/* move to the center of the indicator/led */
 		if (_elements & Text) {
+			int led_xoff = ceil(char_pixel_width() + _diameter * .5);
 			if (_led_left) {
-				cairo_translate (cr, text_margin + (_diameter/2.0), get_height()/2.0);
+				cairo_translate (cr, led_xoff, get_height() * .5);
 			} else {
-				cairo_translate (cr, get_width() - ((_diameter/2.0) + 4.0), get_height()/2.0);
+				cairo_translate (cr, get_width() - led_xoff, get_height() * .5);
 			}
 		} else {
-			cairo_translate (cr, get_width()/2.0, get_height()/2.0);
+			cairo_translate (cr, get_width() * .5, get_height() * .5);
 		}
-		
+
 		//inset
 		if (!_flat_buttons) {
-			cairo_arc (cr, 0, 0, _diameter/2, 0, 2 * M_PI);
+			cairo_arc (cr, 0, 0, _diameter * .5, 0, 2 * M_PI);
 			cairo_set_source (cr, led_inset_pattern);
 			cairo_fill (cr);
 		}
 
 		//black ring
 		cairo_set_source_rgb (cr, 0, 0, 0);
-		cairo_arc (cr, 0, 0, _diameter/2-1, 0, 2 * M_PI);
+		cairo_arc (cr, 0, 0, _diameter * .5 - 1 * UIConfiguration::instance().get_ui_scale(), 0, 2 * M_PI);
 		cairo_fill(cr);
 
 		//led color
 		ArdourCanvas::set_source_rgba (cr, led_color);
-		cairo_arc (cr, 0, 0, _diameter/2-3, 0, 2 * M_PI);
+		cairo_arc (cr, 0, 0, _diameter * .5 - 3 * UIConfiguration::instance().get_ui_scale(), 0, 2 * M_PI);
 		cairo_fill(cr);
-		
+
 		cairo_restore (cr);
 	}
 
-
-	// a transparent gray layer to indicate insensitivity
+	// a transparent overlay to indicate insensitivity
 	if ((visual_state() & Gtkmm2ext::Insensitive)) {
-		rounded_function (cr, 1, 1, get_width() - 2, get_height() - 2, _corner_radius);
-		cairo_set_source_rgba (cr, 0.505, 0.517, 0.525, 0.6);
+		rounded_function (cr, 0, 0, get_width(), get_height(), corner_radius);
+		uint32_t ins_color = UIConfiguration::instance().color ("gtk_background");
+		ArdourCanvas::set_source_rgb_a (cr, ins_color, 0.6);
 		cairo_fill (cr);
 	}
 
 	// if requested, show hovering
-	if (ARDOUR::Config->get_widget_prelight()
+	if (UIConfiguration::instance().get_widget_prelight()
 			&& !((visual_state() & Gtkmm2ext::Insensitive))) {
 		if (_hovering) {
-			rounded_function (cr, 1, 1, get_width() - 2, get_height() - 2, _corner_radius);
+			rounded_function (cr, 1, 1, get_width() - 2, get_height() - 2, corner_radius);
 			cairo_set_source_rgba (cr, 0.905, 0.917, 0.925, 0.2);
 			cairo_fill (cr);
 		}
 	}
 
-	//user is currently pressing the button.  black outline helps to indicate this
-	if ( _grabbed && !(_elements & (Inactive|Menu))) {
-		rounded_function (cr, 1, 1, get_width() - 2, get_height() - 2, _corner_radius);
+	//user is currently pressing the button. dark outline helps to indicate this
+	if (_grabbed && !(_elements & (Inactive|Menu))) {
+		rounded_function (cr, 1, 1, get_width() - 2, get_height() - 2, corner_radius);
 		cairo_set_line_width(cr, 2);
-		cairo_set_source_rgba (cr, 0.1, 0.1, 0.1, .5); // XXX no longer 'black'
+		cairo_set_source_rgba (cr, 0.1, 0.1, 0.1, .5);
 		cairo_stroke (cr);
 	}
-	
+
 	//some buttons (like processor boxes) can be selected  (so they can be deleted).  Draw a selection indicator
 	if (visual_state() & Gtkmm2ext::Selected) {
-#if 0 // outline, edge + 1px outside
-		cairo_set_line_width(cr, 2);
-		cairo_set_source_rgba (cr, 1, 0, 0, 0.8);
-#else // replace edge (if any)
 		cairo_set_line_width(cr, 1);
 		cairo_set_source_rgba (cr, 1, 0, 0, 0.8);
-#endif
-		rounded_function (cr, 0.5, 0.5, get_width() - 1, get_height() - 1, _corner_radius);
+		rounded_function (cr, 0.5, 0.5, get_width() - 1, get_height() - 1, corner_radius);
 		cairo_stroke (cr);
 	}
-	
+
 	//I guess this means we have keyboard focus.  I don't think this works currently
 	//
 	//A: yes, it's keyboard focus and it does work when there's no editor window
 	//   (the editor is always the first receiver for KeyDown).
 	//   It's needed for eg. the engine-dialog at startup or after closing a sesion.
 	if (_focused) {
-		rounded_function (cr, 1.5, 1.5, get_width() - 3, get_height() - 3, _corner_radius);
+		rounded_function (cr, 1.5, 1.5, get_width() - 3, get_height() - 3, corner_radius);
 		cairo_set_source_rgba (cr, 0.905, 0.917, 0.925, 0.8);
 		double dashes = 1;
 		cairo_set_dash (cr, &dashes, 1, 0);
@@ -473,100 +510,171 @@ ArdourButton::render (cairo_t* cr, cairo_rectangle_t *)
 }
 
 void
-ArdourButton::set_diameter (float d)
+ArdourButton::set_corner_radius (float r)
 {
-	_diameter = (d*2) + 5.0;
-
-	if (_diameter != 0.0) {
-		_fixed_diameter = true;
-	}
-
-	build_patterns ();
-	queue_resize ();
+	_corner_radius = r;
+	CairoWidget::set_dirty ();
 }
 
 void
-ArdourButton::set_corner_radius (float r)
+ArdourButton::on_realize()
 {
-	_corner_radius = r;
-	set_dirty ();
+	CairoWidget::on_realize ();
+	ensure_layout ();
+	if (_layout && _layout->get_text() != _text) {
+		_layout->set_text (_text);
+		queue_resize ();
+	}
 }
 
 void
 ArdourButton::on_size_request (Gtk::Requisition* req)
 {
-	int xpad = 0;
-	int ypad = 6;
-
+	req->width = req->height = 0;
 	CairoWidget::on_size_request (req);
 
-	if ((_elements & Text) && !_text.empty()) {
+	if (_diameter == 0) {
+		const float newdia = rintf (11.f * UIConfiguration::instance().get_ui_scale());
+		if (_diameter != newdia) {
+			_pattern_height = 0;
+			_diameter = newdia;
+		}
+	}
 
-		//calc our real width for our string (but ignore the height, because that results in inconsistent button heights)
-		int ignored;
-		_layout->get_pixel_size (_text_width, ignored);
+	if (_elements & Text) {
 
-		//calc the height using some text with both ascenders and descenders
-		std::string t = _layout->get_text();
-		_layout->set_text ("WjgO");  //what we put here probably doesn't matter, as long as its the same for everyone
-		_layout->get_pixel_size (ignored, _text_height);
-		_layout->set_text (t);
+		if (_tweaks & OccasionalText) {
 
-		if (_text_width + _diameter < 75) {
-			xpad = 7;
-		} else {
-			xpad = 12;
+			/* size should not change based on presence or absence
+			 * of text.
+			 */
+
+			if (!_text.empty()) {
+				ensure_layout ();
+				_layout->set_text (_text);
+				_layout->get_pixel_size (_text_width, _text_height);
+			}
+
+		} else if (!_text.empty()) {
+
+			//if _layout does not exist, char_pixel_height() creates it,
+
+			req->height = std::max(req->height, (int) ceil(char_pixel_height() * BASELINESTRETCH + 1.0));
+			assert (_layout);
+			_layout->get_pixel_size (_text_width, _text_height);
+			req->width += rint(1.75 * char_pixel_width()); // padding
+			req->width += _text_width;
+		}
+
+		/* XXX hack (surprise). Deal with two common rotation angles */
+
+		if (_angle == 90 || _angle == 270) {
+			/* do not swap text width or height because we rely on
+			   these being the un-rotated values in ::render()
+			*/
+			swap (req->width, req->height);
 		}
+
 	} else {
 		_text_width = 0;
 		_text_height = 0;
 	}
 
 	if (_pixbuf) {
-		xpad = 6;
+		req->width += _pixbuf->get_width() + char_pixel_width();
+		req->height = std::max(req->height, _pixbuf->get_height() + 4);
 	}
 
-        if ((_elements & Indicator) && _fixed_diameter) {
-		if (_pixbuf) {
-			req->width = _pixbuf->get_width() + lrint (_diameter) + xpad;
-			req->height = max (_pixbuf->get_height(), (int) lrint (_diameter)) + ypad;
-		} else {
-			req->width = _text_width + lrint (_diameter) + xpad * 2; // margin left+right * 2
-			req->height = max (_text_height, (int) lrint (_diameter)) + ypad;
-		}
-        } else {
-		if (_pixbuf) {
-			req->width = _pixbuf->get_width() + xpad;
-			req->height = _pixbuf->get_height() + ypad;
-		}  else {
-			req->width = _text_width + xpad;
-			req->height = _text_height + ypad;
-		}
+	if (_elements & Indicator) {
+		req->width += lrint (_diameter) + char_pixel_width();
+		req->height = std::max (req->height, (int) lrint (_diameter) + 4);
+	}
+
+	if ((_elements & Menu)) {
+		req->width += _diameter + 4;
+	}
+
+	if (_elements & VectorIcon) {
+		assert(!(_elements & Text));
+		const int wh = std::max (6., std::max (rint (TRACKHEADERBTNW * char_avg_pixel_width()), ceil (char_pixel_height() * BASELINESTRETCH + 1.)));
+		req->width += wh;
+		req->height = std::max(req->height, wh);
+	}
+
+	/* Tweaks to mess the nice stuff above up again. */
+	if (_tweaks & TrackHeader) {
+		// forget everything above and just use a fixed square [em] size
+		// "TrackHeader Buttons" are single letter (usually uppercase)
+		// a SizeGroup is much less efficient (lots of gtk work under the hood for each track)
+		const int wh = std::max (rint (TRACKHEADERBTNW * char_avg_pixel_width()), ceil (char_pixel_height() * BASELINESTRETCH + 1.));
+		req->width  = wh;
+		req->height = wh;
 	}
-	req->width += _corner_radius;
+	else if (_tweaks & Square) {
+		// currerntly unused (again)
+		if (req->width < req->height)
+			req->width = req->height;
+		if (req->height < req->width)
+			req->height = req->width;
+	} else if (_text_width > 0 && !(_elements & (Menu | Indicator))) {
+		// properly centered text for those elements that are centered
+		// (no sub-pixel offset)
+		if ((req->width - _text_width) & 1) { ++req->width; }
+		if ((req->height - _text_height) & 1) { ++req->height; }
+	}
+#if 0
+		printf("REQ: %s: %dx%d\n", get_name().c_str(), req->width, req->height);
+#endif
 }
 
 /**
  * This sets the colors used for rendering based on the name of the button, and
- * thus uses information from the GUI config data. 
+ * thus uses information from the GUI config data.
  */
 void
 ArdourButton::set_colors ()
 {
-	if (_fixed_colors_set) {
+	_update_colors = false;
+
+	if (_fixed_colors_set == 0x3) {
 		return;
 	}
+
 	std::string name = get_name();
+	bool failed = false;
 
-	fill_active_color = ARDOUR_UI::config()->color_by_name (string_compose ("%1: fill active", name));
-	fill_inactive_color = ARDOUR_UI::config()->color_by_name (string_compose ("%1: fill", name));
+	if (!(_fixed_colors_set & 0x1)) {
+		fill_active_color = UIConfiguration::instance().color (string_compose ("%1: fill active", name), &failed);
+		if (failed) {
+			fill_active_color = UIConfiguration::instance().color ("generic button: fill active");
+		}
+	}
 
-	text_active_color = ARDOUR_UI::config()->color_by_name (string_compose ("%1: text active", name));
-	text_inactive_color = ARDOUR_UI::config()->color_by_name (string_compose ("%1: text", name));
+	if (!(_fixed_colors_set & 0x2)) {
+		fill_inactive_color = UIConfiguration::instance().color (string_compose ("%1: fill", name), &failed);
+		if (failed) {
+			fill_inactive_color = UIConfiguration::instance().color ("generic button: fill");
+		}
+	}
 
-	led_active_color = ARDOUR_UI::config()->color_by_name (string_compose ("%1: led active", name));
-	led_inactive_color = ARDOUR_UI::config()->color_by_name (string_compose ("%1: led", name));
+	text_active_color = ArdourCanvas::contrasting_text_color (fill_active_color);
+	text_inactive_color = ArdourCanvas::contrasting_text_color (fill_inactive_color);
+
+	led_active_color = UIConfiguration::instance().color (string_compose ("%1: led active", name), &failed);
+	if (failed) {
+		led_active_color = UIConfiguration::instance().color ("generic button: led active");
+	}
+
+	/* The inactive color for the LED is just a fairly dark version of the
+	 * active color.
+	 */
+
+	ArdourCanvas::HSV inactive (led_active_color);
+	inactive.v = 0.35;
+
+	led_inactive_color = inactive.color ();
 }
+
 /**
  * This sets the colors used for rendering based on two fixed values, rather
  * than basing them on the button name, and thus information in the GUI config
@@ -574,45 +682,58 @@ ArdourButton::set_colors ()
  */
 void ArdourButton::set_fixed_colors (const uint32_t color_active, const uint32_t color_inactive)
 {
-	_fixed_colors_set = true;
+	set_active_color (color_active);
+	set_inactive_color (color_inactive);
+}
 
-	fill_active_color = color_active;
-	fill_inactive_color = color_inactive;
+void ArdourButton::set_active_color (const uint32_t color)
+{
+	_fixed_colors_set |= 0x1;
+
+	fill_active_color = color;
 
 	unsigned char r, g, b, a;
-	UINT_TO_RGBA(color_active, &r, &g, &b, &a);
-	
+	UINT_TO_RGBA(color, &r, &g, &b, &a);
+
 	double white_contrast = (max (double(r), 255.) - min (double(r), 255.)) +
 		(max (double(g), 255.) - min (double(g), 255.)) +
 		(max (double(b), 255.) - min (double(b), 255.));
-	
+
 	double black_contrast = (max (double(r), 0.) - min (double(r), 0.)) +
 		(max (double(g), 0.) - min (double(g), 0.)) +
 		(max (double(b), 0.) - min (double(b), 0.));
-	
+
 	text_active_color = (white_contrast > black_contrast) ?
 		RGBA_TO_UINT(255, 255, 255, 255) : /* use white */
 		RGBA_TO_UINT(  0,   0,   0,   255);  /* use black */
-	
 
-	UINT_TO_RGBA(color_inactive, &r, &g, &b, &a);
+	/* XXX what about led colors ? */
+	CairoWidget::set_dirty ();
+}
+
+void ArdourButton::set_inactive_color (const uint32_t color)
+{
+	_fixed_colors_set |= 0x2;
+
+	fill_inactive_color = color;
+
+	unsigned char r, g, b, a;
+	UINT_TO_RGBA(color, &r, &g, &b, &a);
 
-	white_contrast = (max (double(r), 255.) - min (double(r), 255.)) +
+	double white_contrast = (max (double(r), 255.) - min (double(r), 255.)) +
 		(max (double(g), 255.) - min (double(g), 255.)) +
 		(max (double(b), 255.) - min (double(b), 255.));
-	
-	black_contrast = (max (double(r), 0.) - min (double(r), 0.)) +
+
+	double black_contrast = (max (double(r), 0.) - min (double(r), 0.)) +
 		(max (double(g), 0.) - min (double(g), 0.)) +
 		(max (double(b), 0.) - min (double(b), 0.));
-	
+
 	text_inactive_color = (white_contrast > black_contrast) ?
 		RGBA_TO_UINT(255, 255, 255, 255) : /* use white */
 		RGBA_TO_UINT(  0,   0,   0,   255);  /* use black */
-	
-	/* XXX what about led colors ? */
 
-	build_patterns ();
-	set_name (""); /* this will trigger a "style-changed" message and then set_colors() */
+	/* XXX what about led colors ? */
+	CairoWidget::set_dirty ();
 }
 
 void
@@ -630,27 +751,24 @@ ArdourButton::build_patterns ()
 
 	if (led_inset_pattern) {
 		cairo_pattern_destroy (led_inset_pattern);
+		led_inset_pattern = 0;
 	}
-	
-	float width = get_width();  float height = get_height();
 
 	//convex gradient
-	convex_pattern = cairo_pattern_create_linear (0.0, 0, 0.0,  height);
+	convex_pattern = cairo_pattern_create_linear (0.0, 0, 0.0,  get_height());
 	cairo_pattern_add_color_stop_rgba (convex_pattern, 0.0, 0,0,0, 0.0);
 	cairo_pattern_add_color_stop_rgba (convex_pattern, 1.0, 0,0,0, 0.35);
 
 	//concave gradient
-	concave_pattern = cairo_pattern_create_linear (0.0, 0, 0.0,  height);
+	concave_pattern = cairo_pattern_create_linear (0.0, 0, 0.0,  get_height());
 	cairo_pattern_add_color_stop_rgba (concave_pattern, 0.0, 0,0,0, 0.5);
 	cairo_pattern_add_color_stop_rgba (concave_pattern, 0.7, 0,0,0, 0.0);
 
-	if (_elements & Indicator) {
-		led_inset_pattern = cairo_pattern_create_linear (0.0, 0.0, 0.0, _diameter);
-		cairo_pattern_add_color_stop_rgba (led_inset_pattern, 0, 0,0,0, 0.4);
-		cairo_pattern_add_color_stop_rgba (led_inset_pattern, 1, 1,1,1, 0.7);
-	}
+	led_inset_pattern = cairo_pattern_create_linear (0.0, 0.0, 0.0, _diameter);
+	cairo_pattern_add_color_stop_rgba (led_inset_pattern, 0, 0,0,0, 0.4);
+	cairo_pattern_add_color_stop_rgba (led_inset_pattern, 1, 1,1,1, 0.7);
 
-	set_dirty ();
+	_pattern_height = get_height() ;
 }
 
 void
@@ -662,8 +780,10 @@ ArdourButton::set_led_left (bool yn)
 bool
 ArdourButton::on_button_press_event (GdkEventButton *ev)
 {
-	if ((_elements & Indicator) && _led_rect && _distinct_led_click) {
-		if (ev->x >= _led_rect->x && ev->x < _led_rect->x + _led_rect->width && 
+	focus_handler (this);
+
+	if (ev->button == 1 && (_elements & Indicator) && _led_rect && _distinct_led_click) {
+		if (ev->x >= _led_rect->x && ev->x < _led_rect->x + _led_rect->width &&
 		    ev->y >= _led_rect->y && ev->y < _led_rect->y + _led_rect->height) {
 			return true;
 		}
@@ -672,11 +792,11 @@ ArdourButton::on_button_press_event (GdkEventButton *ev)
 	if (binding_proxy.button_press_handler (ev)) {
 		return true;
 	}
-	
+
 	_grabbed = true;
-	queue_draw ();
+	CairoWidget::set_dirty ();
 
-	if (!_act_on_release) {
+	if (ev->button == 1 && !_act_on_release) {
 		if (_action) {
 			_action->activate ();
 			return true;
@@ -692,19 +812,19 @@ ArdourButton::on_button_press_event (GdkEventButton *ev)
 bool
 ArdourButton::on_button_release_event (GdkEventButton *ev)
 {
-	if (_hovering && (_elements & Indicator) && _led_rect && _distinct_led_click) {
-		if (ev->x >= _led_rect->x && ev->x < _led_rect->x + _led_rect->width && 
+	if (ev->button == 1 && _hovering && (_elements & Indicator) && _led_rect && _distinct_led_click) {
+		if (ev->x >= _led_rect->x && ev->x < _led_rect->x + _led_rect->width &&
 		    ev->y >= _led_rect->y && ev->y < _led_rect->y + _led_rect->height) {
-			signal_led_clicked(); /* EMIT SIGNAL */
+			signal_led_clicked(ev); /* EMIT SIGNAL */
 			return true;
 		}
 	}
 
 	_grabbed = false;
-	queue_draw ();
+	CairoWidget::set_dirty ();
 
-	if (_hovering) {
-		signal_clicked ();	
+	if (ev->button == 1 && _hovering) {
+		signal_clicked ();
 		if (_act_on_release) {
 			if (_action) {
 				_action->activate ();
@@ -712,7 +832,7 @@ ArdourButton::on_button_release_event (GdkEventButton *ev)
 			}
 		}
 	}
-	
+
 	if (_fallthrough_to_parent)
 		return false;
 
@@ -729,9 +849,8 @@ ArdourButton::set_distinct_led_click (bool yn)
 void
 ArdourButton::color_handler ()
 {
-	set_colors ();
-	build_patterns ();
-	set_dirty ();
+	_update_colors = true;
+	CairoWidget::set_dirty ();
 }
 
 void
@@ -739,39 +858,38 @@ ArdourButton::on_size_allocate (Allocation& alloc)
 {
 	CairoWidget::on_size_allocate (alloc);
 	setup_led_rect ();
-	build_patterns ();
 }
 
 void
 ArdourButton::set_controllable (boost::shared_ptr<Controllable> c)
 {
-        watch_connection.disconnect ();
-        binding_proxy.set_controllable (c);
+	watch_connection.disconnect ();
+	binding_proxy.set_controllable (c);
 }
 
 void
 ArdourButton::watch ()
 {
-        boost::shared_ptr<Controllable> c (binding_proxy.get_controllable ());
+	boost::shared_ptr<Controllable> c (binding_proxy.get_controllable ());
 
-        if (!c) {
-                warning << _("button cannot watch state of non-existing Controllable\n") << endmsg;
-                return;
-        }
-
-        c->Changed.connect (watch_connection, invalidator(*this), boost::bind (&ArdourButton::controllable_changed, this), gui_context());
+	if (!c) {
+		warning << _("button cannot watch state of non-existing Controllable\n") << endmsg;
+		return;
+	}
+	c->Changed.connect (watch_connection, invalidator(*this), boost::bind (&ArdourButton::controllable_changed, this), gui_context());
 }
 
 void
 ArdourButton::controllable_changed ()
 {
-        float val = binding_proxy.get_controllable()->get_value();
+	float val = binding_proxy.get_controllable()->get_value();
 
 	if (fabs (val) >= 0.5f) {
 		set_active_state (Gtkmm2ext::ExplicitActive);
 	} else {
 		unset_active_state ();
 	}
+	CairoWidget::set_dirty ();
 }
 
 void
@@ -787,7 +905,7 @@ ArdourButton::set_related_action (RefPtr<Action> act)
 		if (tact) {
 			action_toggled ();
 			tact->signal_toggled().connect (sigc::mem_fun (*this, &ArdourButton::action_toggled));
-		} 
+		}
 
 		_action->connect_property_changed ("sensitive", sigc::mem_fun (*this, &ArdourButton::action_sensitivity_changed));
 		_action->connect_property_changed ("visible", sigc::mem_fun (*this, &ArdourButton::action_visibility_changed));
@@ -807,62 +925,63 @@ ArdourButton::action_toggled ()
 			unset_active_state ();
 		}
 	}
-}	
+}
 
 void
 ArdourButton::on_style_changed (const RefPtr<Gtk::Style>&)
 {
-	set_colors ();
-	build_patterns ();
+	_update_colors = true;
+	CairoWidget::set_dirty ();
 }
 
 void
 ArdourButton::on_name_changed ()
 {
-	set_colors ();
-	build_patterns ();
+	_char_pixel_width = 0;
+	_char_pixel_height = 0;
+	_diameter = 0;
+	_update_colors = true;
+	if (is_realized()) {
+		queue_resize ();
+	}
 }
 
 void
 ArdourButton::setup_led_rect ()
 {
-	int text_margin;
-
-	if (get_width() < 75) {
-		text_margin = 3;
-	} else {
-		text_margin = 10;
+	if (!(_elements & Indicator)) {
+		delete _led_rect;
+		_led_rect = 0;
+		return;
 	}
 
-	if (_elements & Indicator) {
+	if (!_led_rect) {
 		_led_rect = new cairo_rectangle_t;
-		
-		if (_elements & Text) {
-			if (_led_left) {
-				_led_rect->x = text_margin;
-			} else {
-				_led_rect->x = get_width() - text_margin - _diameter/2.0;
-			}
+	}
+
+	if (_elements & Text) {
+		if (_led_left) {
+			_led_rect->x = char_pixel_width();
 		} else {
-			/* centered */
-			_led_rect->x = get_width()/2.0 - _diameter/2.0;
+			_led_rect->x = get_width() - char_pixel_width() + _diameter;
 		}
-
-		_led_rect->y = get_height()/2.0 - _diameter/2.0;
-		_led_rect->width = _diameter;
-		_led_rect->height = _diameter;
-
 	} else {
-		delete _led_rect;
-		_led_rect = 0;
+		/* centered */
+		_led_rect->x = .5 * get_width() - _diameter;
 	}
+
+	_led_rect->y = .5 * (get_height() - _diameter);
+	_led_rect->width = _diameter;
+	_led_rect->height = _diameter;
 }
 
 void
 ArdourButton::set_image (const RefPtr<Gdk::Pixbuf>& img)
 {
 	_pixbuf = img;
-	queue_draw ();
+	if (is_realized()) {
+		queue_resize ();
+	}
 }
 
 void
@@ -871,28 +990,27 @@ ArdourButton::set_active_state (Gtkmm2ext::ActiveState s)
 	bool changed = (_active_state != s);
 	CairoWidget::set_active_state (s);
 	if (changed) {
-		set_colors ();
-		build_patterns ();
+		_update_colors = true;
+		CairoWidget::set_dirty ();
 	}
 }
-	
+
 void
 ArdourButton::set_visual_state (Gtkmm2ext::VisualState s)
 {
 	bool changed = (_visual_state != s);
 	CairoWidget::set_visual_state (s);
 	if (changed) {
-		set_colors ();
-		build_patterns ();
+		_update_colors = true;
+		CairoWidget::set_dirty ();
 	}
 }
-	
 
 bool
 ArdourButton::on_focus_in_event (GdkEventFocus* ev)
 {
 	_focused = true;
-	queue_draw ();
+	CairoWidget::set_dirty ();
 	return CairoWidget::on_focus_in_event (ev);
 }
 
@@ -900,14 +1018,14 @@ bool
 ArdourButton::on_focus_out_event (GdkEventFocus* ev)
 {
 	_focused = false;
-	queue_draw ();
+	CairoWidget::set_dirty ();
 	return CairoWidget::on_focus_out_event (ev);
 }
 
 bool
 ArdourButton::on_key_release_event (GdkEventKey *ev) {
 	if (_focused &&
-			(ev->keyval == GDK_KEY_space || ev->keyval == GDK_Return))
+			(ev->keyval == GDK_space || ev->keyval == GDK_Return))
 	{
 		signal_clicked();
 		if (_action) {
@@ -923,8 +1041,8 @@ ArdourButton::on_enter_notify_event (GdkEventCrossing* ev)
 {
 	_hovering = (_elements & Inactive) ? false : true;
 
-	if (ARDOUR::Config->get_widget_prelight()) {
-		queue_draw ();
+	if (UIConfiguration::instance().get_widget_prelight()) {
+		CairoWidget::set_dirty ();
 	}
 
 	return CairoWidget::on_enter_notify_event (ev);
@@ -935,8 +1053,8 @@ ArdourButton::on_leave_notify_event (GdkEventCrossing* ev)
 {
 	_hovering = false;
 
-	if (ARDOUR::Config->get_widget_prelight()) {
-		queue_draw ();
+	if (UIConfiguration::instance().get_widget_prelight()) {
+		CairoWidget::set_dirty ();
 	}
 
 	return CairoWidget::on_leave_notify_event (ev);
@@ -947,7 +1065,9 @@ ArdourButton::set_tweaks (Tweaks t)
 {
 	if (_tweaks != t) {
 		_tweaks = t;
-		queue_draw ();
+		if (is_realized()) {
+			queue_resize ();
+		}
 	}
 }
 
@@ -959,9 +1079,79 @@ ArdourButton::action_sensitivity_changed ()
 	} else {
 		set_visual_state (Gtkmm2ext::VisualState (visual_state() | Gtkmm2ext::Insensitive));
 	}
-	
 }
 
+void
+ArdourButton::set_layout_ellipsize_width (int w)
+{
+	if (_layout_ellipsize_width == w) {
+		return;
+	}
+	_layout_ellipsize_width = w;
+	if (!_layout) {
+		return;
+	}
+	if (_layout_ellipsize_width > 3 * PANGO_SCALE) {
+		_layout->set_width (_layout_ellipsize_width - 3 * PANGO_SCALE);
+	}
+	if (is_realized ()) {
+		queue_resize ();
+	}
+}
+
+void
+ArdourButton::set_text_ellipsize (Pango::EllipsizeMode e)
+{
+	if (_ellipsis == e) {
+		return;
+	}
+	_ellipsis = e;
+	if (!_layout) {
+		return;
+	}
+	_layout->set_ellipsize(_ellipsis);
+	if (_layout_ellipsize_width > 3 * PANGO_SCALE) {
+		_layout->set_width (_layout_ellipsize_width - 3 * PANGO_SCALE);
+	}
+	if (is_realized ()) {
+		queue_resize ();
+	}
+}
+
+void
+ArdourButton::ensure_layout ()
+{
+	if (!_layout) {
+		ensure_style ();
+		_layout = Pango::Layout::create (get_pango_context());
+		_layout->set_ellipsize(_ellipsis);
+		if (_layout_ellipsize_width > 3 * PANGO_SCALE) {
+			_layout->set_width (_layout_ellipsize_width - 3* PANGO_SCALE);
+		}
+	}
+}
+
+void
+ArdourButton::recalc_char_pixel_geometry ()
+{
+	if (_char_pixel_height > 0 && _char_pixel_width > 0) {
+		return;
+	}
+	ensure_layout();
+	// NB. this is not static, since the geometry is different
+	// depending on the font used.
+	int w, h;
+	std::string x = _("ABCDEFGHIJLKMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789");
+	_layout->set_text (x);
+	_layout->get_pixel_size (w, h);
+	_char_pixel_height = std::max(4, h);
+	// number of actual chars in the string (not bytes)
+	// Glib to the rescue.
+	Glib::ustring gx(x);
+	_char_avg_pixel_width = w / (float)gx.size();
+	_char_pixel_width = std::max(4, (int) ceil (_char_avg_pixel_width));
+	_layout->set_text (_text);
+}
 
 void
 ArdourButton::action_visibility_changed ()
@@ -977,17 +1167,39 @@ void
 ArdourButton::action_tooltip_changed ()
 {
 	string str = _action->property_tooltip().get_value();
-	ARDOUR_UI::instance()->set_tip (*this, str);
+	set_tooltip (*this, str);
 }
 
 void
 ArdourButton::set_elements (Element e)
 {
 	_elements = e;
+	CairoWidget::set_dirty ();
 }
 
 void
 ArdourButton::add_elements (Element e)
 {
 	_elements = (ArdourButton::Element) (_elements | e);
+	CairoWidget::set_dirty ();
+}
+
+void
+ArdourButton::set_icon (Gtkmm2ext::ArdourIcon::Icon i)
+{
+	_icon = i;
+	_elements = (ArdourButton::Element) ((_elements | ArdourButton::VectorIcon) & ~ArdourButton::Text);
+	CairoWidget::set_dirty ();
+}
+
+void
+ArdourButton::set_custom_led_color (uint32_t c, bool useit)
+{
+	if (led_custom_color == c && use_custom_led_color == useit) {
+		return;
+	}
+
+	led_custom_color = c;
+	use_custom_led_color = useit;
+	CairoWidget::set_dirty ();
 }