sample animation

examples/example1/src/main.d

@@ -7,6 +7,51 @@ import std.conv;
 
 mixin APP_ENTRY_POINT;
 
+class SampleAnimationWidget : Widget {
+	ulong animationProgress;
+	this(string ID) {
+		super(ID);
+	}
+	/// returns true is widget is being animated - need to call animate() and redraw
+	@property override bool animating() { return true; }
+	/// animates window; interval is time left from previous draw, in hnsecs (1/10000000 of second)
+	override void animate(long interval) {
+		animationProgress += interval;
+		invalidate();
+	}
+	void drawAnimatedRect(DrawBuf buf, uint p, Rect rc, int speedx, int speedy, int sz) {
+		int x = (p * speedx % rc.width);
+		int y = (p * speedy % rc.height);
+		if (x < 0)
+			x += rc.width;
+		if (y < 0)
+			y += rc.height;
+		uint a = 64 + ((p / 2) & 0x7F);
+		uint r = 128 + ((p / 7) & 0x7F);
+		uint g = 128 + ((p / 5) & 0x7F);
+		uint b = 128 + ((p / 3) & 0x7F);
+		uint color = (a << 24) | (r << 16) | (g << 8) | b;
+		buf.fillRect(Rect(rc.left + x, rc.top + y, rc.left + x + sz, rc.top + y + sz), color);
+	}
+	/// Draw widget at its position to buffer
+	override void onDraw(DrawBuf buf) {
+		if (visibility != Visibility.Visible)
+			return;
+		super.onDraw(buf);
+		Rect rc = _pos;
+		applyMargins(rc);
+		auto saver = ClipRectSaver(buf, rc, alpha);
+		applyPadding(rc);
+		drawAnimatedRect(buf, cast(uint)(animationProgress / 295430), rc, 2, 3, 100);
+		drawAnimatedRect(buf, cast(uint)(animationProgress / 312400) + 100, rc, 3, 2, 130);
+		drawAnimatedRect(buf, cast(uint)(animationProgress / 212400) + 200, rc, -2, 1, 290);
+		drawAnimatedRect(buf, cast(uint)(animationProgress / 512400) + 300, rc, 2, -2, 200);
+		drawAnimatedRect(buf, cast(uint)(animationProgress / 214230) + 800, rc, 1, 2, 390);
+		drawAnimatedRect(buf, cast(uint)(animationProgress / 123320) + 900, rc, -1, -3, 150);
+		drawAnimatedRect(buf, cast(uint)(animationProgress / 100000) + 100, rc, -1, -1, 120);
+	}
+}
+
 Widget createEditorSettingsControl(EditWidgetBase editor) {
     HorizontalLayout res = new HorizontalLayout("editor_options");
     res.addChild((new CheckBox("wantTabs", "wantTabs"d)).checked(editor.wantTabs).addOnCheckChangeListener(delegate(Widget, bool checked) { editor.wantTabs = checked; return true;}));
@@ -294,6 +339,8 @@ extern (C) int UIAppMain(string[] args) {
 
         tabs.addTab((new TextWidget()).id("tab5").textColor(0x00802000).text("Tab 5 contents"), "Tab 5"d);
 
+		tabs.addTab((new SampleAnimationWidget("tab6")).layoutWidth(FILL_PARENT).layoutHeight(FILL_PARENT), "Animation"d);
+
         //==========================================================================
 		// create Editors test tab
 		VerticalLayout editors = new VerticalLayout("editors");

src/dlangui/platforms/common/platform.d

@@ -171,7 +171,8 @@ class Window {
             // layout required flag could be changed during animate - check again
             checkUpdateNeeded(needDraw, needLayout, animationActive);
         }
-        if (needLayout) {
+		lastDrawTs = ts;
+		if (needLayout) {
             long measureStart = currentTimeMillis;
             measure();
             long measureEnd = currentTimeMillis;
@@ -192,7 +193,6 @@ class Window {
         long drawEnd = currentTimeMillis;
 		if (drawEnd - drawStart > PERFORMANCE_LOGGING_THRESHOLD_MS)
         	Log.d("draw took ", drawEnd - drawStart, " ms");
-        lastDrawTs = ts;
         if (animationActive)
             scheduleAnimation();
     }
@@ -471,7 +471,7 @@ class Window {
     protected void checkUpdateNeeded(Widget root, ref bool needDraw, ref bool needLayout, ref bool animationActive) {
         if (root is null)
             return;
-        if (!root.visibility == Visibility.Visible)
+        if (root.visibility != Visibility.Visible)
             return;
         needDraw = root.needDraw || needDraw;
         if (!needLayout) {
@@ -480,7 +480,8 @@ class Window {
                 Log.d("need layout: ", root.id);
             }
         }
-        animationActive = root.animating || animationActive;
+		if (root.animating && root.visible)
+        	animationActive = true; // check animation only for visible widgets
         for (int i = 0; i < root.childCount; i++)
             checkUpdateNeeded(root.child(i), needDraw, needLayout, animationActive);
     }

src/dlangui/platforms/sdl/sdlapp.d

@@ -139,6 +139,11 @@ version(USE_SDL) {
 			SDL_SetWindowTitle(_win, _caption.toStringz);
 		}
 
+		/// after drawing, call to schedule redraw if animation is active
+		override void scheduleAnimation() {
+			invalidate();
+		}
+
         SDL_Texture * _texture;
         int _txw;
         int _txh;

src/dlangui/widgets/widget.d

@@ -411,7 +411,7 @@ class Widget {
     @property bool needDraw() { return _needDraw; }
     /// returns true is widget is being animated - need to call animate() and redraw
     @property bool animating() { return false; }
-    /// animates window; interval is time left from previous draw, in hnsecs (1/10000 of second)
+    /// animates window; interval is time left from previous draw, in hnsecs (1/10000000 of second)
     void animate(long interval) {
     }
     /// returns measured width (calculated during measure() call)