The return of the long awaited for Sliding Tabs, that even Linux users envy!

Needs some cleanup, passed values should be inside [0:1].
Need to make sure changing the title doesn't reset the tab to left.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@17571 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/servers/app/Decorator.h

@@ -95,7 +95,9 @@ class Decorator {
 			void				ResizeBy(float x, float y, BRegion* dirty);
 	virtual	void				ResizeBy(BPoint pt, BRegion* dirty) = 0;
 
-	virtual	void				SetTabLocation(float location) {}
+	/*! \return true if tab location updated, false if out of bounds or unsupported */
+	virtual	bool				SetTabLocation(float location, BRegion* updateRegion = NULL)
+									{ (void)updateRegion; return false; }
 	virtual	float				TabLocation() const
 									{ return 0.0; }
 

src/servers/app/DefaultDecorator.cpp

@@ -337,6 +337,31 @@ DefaultDecorator::ResizeBy(BPoint pt, BRegion* dirty)
 	}
 }
 
+bool
+DefaultDecorator::SetTabLocation(float location, BRegion* updateRegion)
+{
+	STRACE(("DefaultDecorator: Set Tab Location(%.1f)\n", location));
+	if (!_tabrect.IsValid())
+		return false;
+	if (location < 0)
+		location = 0;
+	if (location > (fRightBorder.right - fLeftBorder.left - _tabrect.Width()))
+		location = (fRightBorder.right - fLeftBorder.left - _tabrect.Width());
+	float delta = location - fTabOffset;
+	// redraw old rect (1 pix on the border also must be updated)
+	BRect trect(_tabrect);
+	trect.bottom++;
+	updateRegion->Include(trect);
+	_tabrect.OffsetBy(delta, 0);
+	fTabOffset = (int32)location;
+	_LayoutTabItems(_tabrect);
+	// redraw new rect as well
+	trect = _tabrect;
+	trect.bottom++;
+	updateRegion->Include(trect);
+	return true;
+}
+
 // Draw
 void
 DefaultDecorator::Draw(BRect update)
@@ -439,7 +464,8 @@ DefaultDecorator::Clicked(BPoint pt, int32 buttons, int32 modifiers)
 	// Clicking in the tab?
 	if (_tabrect.Contains(pt)) {
 		// tab sliding in any case if either shift key is held down
-		if (modifiers & B_SHIFT_KEY)
+		// except sliding up-down by moving mouse left-right would look strange
+		if ((modifiers & B_SHIFT_KEY) && (fLook != kLeftTitledWindowLook))
 			return DEC_SLIDETAB;
 
 		clicked = true;

src/servers/app/DefaultDecorator.h

@@ -29,6 +29,8 @@ class DefaultDecorator: public Decorator {
 
 		virtual	void	MoveBy(BPoint pt);
 		virtual	void	ResizeBy(BPoint pt, BRegion* dirty);
+		virtual bool	SetTabLocation(float location, BRegion* updateRegion = NULL);
+		virtual float	TabLocation() const { return (float)fTabOffset;; }
 
 		virtual	void	Draw(BRect r);
 		virtual	void	Draw();

src/servers/app/Desktop.cpp

@@ -1575,6 +1575,26 @@ Desktop::ResizeWindowBy(WindowLayer* window, float x, float y)
 	UnlockAllWindows();
 }
 
+void
+Desktop::SetWindowTabLocation(WindowLayer* window, float location)
+{
+	if (!LockAllWindows())
+		return;
+
+	BRegion dirty;
+	window->SetTabLocation(location, dirty);
+
+	if (window->IsVisible() && dirty.CountRects() > 0) {
+		BRegion stillAvailableOnScreen;
+		_RebuildClippingForAllWindows(stillAvailableOnScreen);
+		_SetBackground(stillAvailableOnScreen);
+	
+		_TriggerWindowRedrawing(dirty);
+	}
+
+	UnlockAllWindows();
+}
+
 
 /*!
 	Updates the workspaces of all subset windows with regard to the

src/servers/app/Desktop.h

@@ -111,6 +111,7 @@ class Desktop : public MessageLooper, public ScreenOwner {
 		void					MoveWindowBy(WindowLayer* window, float x, float y,
 									int32 workspace = -1);
 		void					ResizeWindowBy(WindowLayer* window, float x, float y);
+		void					SetWindowTabLocation(WindowLayer* window, float location);
 
 		void					SetWindowWorkspaces(WindowLayer* window,
 									uint32 workspaces);

src/servers/app/WindowLayer.cpp

@@ -1006,7 +1006,11 @@ WindowLayer::MouseMoved(BMessage *message, BPoint where, int32* _viewToken,
 	}
 	// sliding tab
 	if (fIsSlidingTab) {
-		// TODO: implement
+		float loc = TabLocation();
+		// TODO: change to [0:1]
+		loc += delta.x;
+		fDesktop->SetWindowTabLocation(this, loc);
+		delta.y = 0;
 	}
 
 	// NOTE: fLastMousePosition is currently only
@@ -1200,11 +1204,16 @@ WindowLayer::GetSizeLimits(int32* minWidth, int32* maxWidth,
 }
 
 
-void
-WindowLayer::SetTabLocation(float location)
+bool
+WindowLayer::SetTabLocation(float location, BRegion& dirty)
 {
-	if (fDecorator)
-		fDecorator->SetTabLocation(location);
+	bool ret = false;
+	if (fDecorator) {
+		ret = fDecorator->SetTabLocation(location, &dirty);
+		fBorderRegionValid = false;
+		// the border very likely changed
+	}
+	return ret;
 }
 
 

src/servers/app/WindowLayer.h

@@ -169,7 +169,7 @@ class WindowLayer {
 									int32* minHeight, int32* maxHeight) const;
 
 								// 0.0 -> left .... 1.0 -> right
-			void				SetTabLocation(float location);
+			bool				SetTabLocation(float location, BRegion& dirty);
 			float				TabLocation() const;
 
 			void				HighlightDecorator(bool active);