DockingWindow will need a timer after all

to update layout after initial show when
contents change

Change-Id: I8edbe84fa366cdb04dbfe5e479dc01cbf04dbf4c

include/vcl/dockwin.hxx

@@ -247,6 +247,7 @@ private:
     sal_Int32           mnDockRight;
     sal_Int32           mnDockBottom;
     WinBits         mnFloatBits;
+    Idle            maLayoutIdle;
     bool            mbDockCanceled:1,
                     mbDockPrevented:1,
                     mbFloatPrevented:1,
@@ -268,6 +269,7 @@ private:
 
     SAL_DLLPRIVATE void    ImplInitDockingWindowData();
     SAL_DLLPRIVATE void setPosSizeOnContainee(Size aSize, Window &rBox);
+    DECL_DLLPRIVATE_LINK( ImplHandleLayoutTimerHdl, void* );
 
     // Copy assignment is forbidden and not implemented.
     SAL_DLLPRIVATE         DockingWindow (const DockingWindow &);
@@ -291,6 +293,7 @@ public:
 
     SAL_DLLPRIVATE bool    ImplStartDocking( const Point& rPos );
     SAL_DLLPRIVATE bool    isDeferredInit() const { return mbIsDefferedInit; }
+    SAL_DLLPRIVATE bool    hasPendingLayout() const { return maLayoutIdle.IsActive(); }
     void                   doDeferredInit(WinBits nBits);
 protected:
                     DockingWindow( WindowType nType );
@@ -364,6 +367,7 @@ public:
     virtual void SetText( const OUString& rStr ) SAL_OVERRIDE;
     virtual OUString GetText() const SAL_OVERRIDE;
     virtual Size GetOptimalSize() const SAL_OVERRIDE;
+    virtual void queue_resize(StateChangedType eReason = StateChangedType::LAYOUT) SAL_OVERRIDE;
 };
 
 inline void DockingWindow::SetPin( bool bPin )

vcl/source/window/dockwin.cxx

@@ -329,6 +329,10 @@ void DockingWindow::ImplInitDockingWindowData()
     mbIsCalculatingInitialLayoutSize = false;
     mbInitialLayoutDone = false;
     mpDialogParent = NULL;
+
+    //To-Do, reuse maResizeTimer
+    maLayoutIdle.SetPriority(VCL_IDLE_PRIORITY_RESIZE);
+    maLayoutIdle.SetIdleHdl( LINK( this, DockingWindow, ImplHandleLayoutTimerHdl ) );
 }
 
 void DockingWindow::ImplInit( vcl::Window* pParent, WinBits nStyle )
@@ -1078,6 +1082,8 @@ bool DockingWindow::isLayoutEnabled() const
 
 void DockingWindow::setOptimalLayoutSize()
 {
+    maLayoutIdle.Stop();
+
     //resize DockingWindow to fit requisition on initial show
     Window *pBox = GetWindow(WINDOW_FIRSTCHILD);
 
@@ -1121,4 +1127,30 @@ Size DockingWindow::GetOptimalSize() const
     return Window::CalcWindowSize(aSize);
 }
 
+void DockingWindow::queue_resize(StateChangedType /*eReason*/)
+{
+    if (hasPendingLayout() || isCalculatingInitialLayoutSize())
+        return;
+    if (!isLayoutEnabled())
+        return;
+    WindowImpl *pWindowImpl = mpWindowImpl->mpBorderWindow ? mpWindowImpl->mpBorderWindow->mpWindowImpl : mpWindowImpl;
+    pWindowImpl->mnOptimalWidthCache = -1;
+    pWindowImpl->mnOptimalHeightCache = -1;
+    maLayoutIdle.Start();
+}
+
+IMPL_LINK(DockingWindow, ImplHandleLayoutTimerHdl, void*, EMPTYARG)
+{
+    if (!isLayoutEnabled())
+    {
+        SAL_WARN("vcl.layout", "DockingWindow has become non-layout because extra children have been added directly to it.");
+        return 0;
+    }
+
+    Window *pBox = GetWindow(WINDOW_FIRSTCHILD);
+    assert(pBox);
+    setPosSizeOnContainee(GetSizePixel(), *pBox);
+    return 0;
+}
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */