draw experimentation

minigui.d

@@ -468,6 +468,15 @@ version(Windows) {
 +/
 class Widget : ReflectableProperties {
 
+	private bool willDraw() {
+		return true;
+	}
+
+	private bool skipPaintCycle() {
+		return false;
+	}
+
+
 	/+
 	/++
 		Calling this directly after constructor can give you a reflectable object as-needed so you don't pay for what you don't need.
@@ -1783,6 +1792,9 @@ class Widget : ReflectableProperties {
 		if(hidden)
 			return;
 
+		if(skipPaintCycle())
+			return;
+
 		int paintX = x;
 		int paintY = y;
 		if(this.useNativeDrawing()) {
@@ -6413,6 +6425,11 @@ abstract class Layout : Widget {
 		tabStop = false;
 		super(parent);
 	}
+
+	version(none)
+	override bool willDraw() {
+		return false;
+	}
 }
 
 /++
@@ -7695,8 +7712,6 @@ class Window : Widget {
 		super(p);
 	}
 
-
-
 	private void actualRedraw() {
 		if(recomputeChildLayoutRequired)
 			recomputeChildLayoutEntry();
@@ -7719,7 +7734,7 @@ class Window : Widget {
 			ugh = ugh.parent;
 		}
 		auto painter = w.draw(true);
-		privatePaint(WidgetPainter(painter, this), lox, loy, Rectangle(0, 0, int.max, int.max), false, true);
+		privatePaint(WidgetPainter(painter, this), lox, loy, Rectangle(0, 0, int.max, int.max), false, willDraw());
 	}
 
 
@@ -10874,6 +10889,9 @@ class Button : MouseActivatedWidget {
 	override int heightStretchiness() { return 3; }
 	override int widthStretchiness() { return 3; }
 
+	version(none)
+	override bool skipPaintCycle() { return true; }
+
 	/++
 		If true, this button will emit trigger events on double (and other quick events, if added) click events as well as on normal single click events.