summaryrefslogtreecommitdiffstats
path: root/view/nsViewManager.h
diff options
context:
space:
mode:
Diffstat (limited to 'view/nsViewManager.h')
-rw-r--r--view/nsViewManager.h445
1 files changed, 445 insertions, 0 deletions
diff --git a/view/nsViewManager.h b/view/nsViewManager.h
new file mode 100644
index 000000000..ca379d4b0
--- /dev/null
+++ b/view/nsViewManager.h
@@ -0,0 +1,445 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsViewManager_h___
+#define nsViewManager_h___
+
+#include "nscore.h"
+#include "nsView.h"
+#include "nsCOMPtr.h"
+#include "nsCRT.h"
+#include "nsTArray.h"
+#include "nsDeviceContext.h"
+#include "nsTArray.h"
+#include "mozilla/EventForwards.h"
+
+class nsIWidget;
+struct nsRect;
+class nsRegion;
+class nsDeviceContext;
+class nsIPresShell;
+
+class nsViewManager final
+{
+ ~nsViewManager();
+public:
+ friend class nsView;
+
+ typedef mozilla::LayoutDeviceIntRect LayoutDeviceIntRect;
+ typedef mozilla::LayoutDeviceIntRegion LayoutDeviceIntRegion;
+
+ NS_DECL_AND_IMPL_ZEROING_OPERATOR_NEW
+
+ NS_INLINE_DECL_REFCOUNTING(nsViewManager)
+
+ nsViewManager();
+
+ /**
+ * Initialize the ViewManager
+ * Note: this instance does not hold a reference to the presshell
+ * because it holds a reference to this instance.
+ * @result The result of the initialization, NS_OK if no errors
+ */
+ nsresult Init(nsDeviceContext* aContext);
+
+ /**
+ * Create an ordinary view
+ * @param aBounds initial bounds for view
+ * XXX We should eliminate this parameter; you can set the bounds after CreateView
+ * @param aParent intended parent for view. this is not actually set in the
+ * nsView through this method. it is only used by the initialization
+ * code to walk up the view tree, if necessary, to find resources.
+ * XXX We should eliminate this parameter!
+ * @param aVisibilityFlag initial visibility state of view
+ * XXX We should eliminate this parameter; you can set it after CreateView
+ * @result The new view. Never null.
+ */
+ nsView* CreateView(const nsRect& aBounds,
+ nsView* aParent,
+ nsViewVisibility aVisibilityFlag = nsViewVisibility_kShow);
+
+ /**
+ * Get the root of the view tree.
+ * @result the root view
+ */
+ nsView* GetRootView() { return mRootView; }
+
+ /**
+ * Set the root of the view tree. Does not destroy the current root view.
+ * aView may have a parent view managed by a different view manager.
+ * aView may have a widget (anything but printing) or may not (printing).
+ * @param aView view to set as root
+ */
+ void SetRootView(nsView *aView);
+
+ /**
+ * Get the dimensions of the root window. The dimensions are in
+ * twips
+ * @param aWidth out parameter for width of window in twips
+ * @param aHeight out parameter for height of window in twips
+ */
+ void GetWindowDimensions(nscoord *aWidth, nscoord *aHeight);
+
+ /**
+ * Set the dimensions of the root window.
+ * Called if the root window is resized. The dimensions are in
+ * twips
+ * @param aWidth of window in twips
+ * @param aHeight of window in twips
+ */
+ void SetWindowDimensions(nscoord aWidth, nscoord aHeight,
+ bool aDelayResize = false);
+
+ /**
+ * Do any resizes that are pending.
+ */
+ void FlushDelayedResize(bool aDoReflow);
+
+ /**
+ * Called to inform the view manager that the entire area of a view
+ * is dirty and needs to be redrawn.
+ * @param aView view to paint. should be root view
+ */
+ void InvalidateView(nsView *aView);
+
+ /**
+ * Called to inform the view manager that some portion of a view is dirty and
+ * needs to be redrawn. The rect passed in should be in the view's coordinate
+ * space. Does not check for paint suppression.
+ * @param aView view to paint. should be root view
+ * @param rect rect to mark as damaged
+ */
+ void InvalidateViewNoSuppression(nsView *aView, const nsRect &aRect);
+
+ /**
+ * Called to inform the view manager that it should invalidate all views.
+ */
+ void InvalidateAllViews();
+
+ /**
+ * Called to dispatch an event to the appropriate view. Often called
+ * as a result of receiving a mouse or keyboard event from the widget
+ * event system.
+ * @param aEvent event to dispatch
+ * @param aViewTarget dispatch the event to this view
+ * @param aStatus event handling status
+ */
+ void DispatchEvent(mozilla::WidgetGUIEvent *aEvent,
+ nsView* aViewTarget,
+ nsEventStatus* aStatus);
+
+ /**
+ * Given a parent view, insert another view as its child.
+ * aSibling and aAbove control the "document order" for the insertion.
+ * If aSibling is null, the view is inserted at the end of the document order
+ * if aAfter is true, otherwise it is inserted at the beginning.
+ * If aSibling is non-null, then if aAfter is true, the view is inserted
+ * after the sibling in document order (appearing above the sibling unless
+ * overriden by z-order).
+ * If it is false, the view is inserted before the sibling.
+ * The view manager generates the appopriate dirty regions.
+ * @param aParent parent view
+ * @param aChild child view
+ * @param aSibling sibling view
+ * @param aAfter after or before in the document order
+ */
+ void InsertChild(nsView *aParent, nsView *aChild, nsView *aSibling,
+ bool aAfter);
+
+ void InsertChild(nsView *aParent, nsView *aChild, int32_t aZIndex);
+
+ /**
+ * Remove a specific child view from its parent. This will NOT remove its placeholder
+ * if there is one.
+ * The view manager generates the appropriate dirty regions.
+ * @param aParent parent view
+ * @param aChild child view
+ */
+ void RemoveChild(nsView *aChild);
+
+ /**
+ * Move a view to the specified position, provided in parent coordinates.
+ * The new position is the (0, 0) origin for the view's coordinate system.
+ * The view's bounds may extend above or to the left of this point.
+ * The view manager generates the appropriate dirty regions.
+ * @param aView view to move
+ * @param aX x value for new view position
+ * @param aY y value for new view position
+ */
+ void MoveViewTo(nsView *aView, nscoord aX, nscoord aY);
+
+ /**
+ * Resize a view. In addition to setting the width and height, you can
+ * set the x and y of its bounds relative to its position. Negative x and y
+ * will let the view extend above and to the left of the (0,0) point in its
+ * coordinate system.
+ * The view manager generates the appropriate dirty regions.
+ * @param aView view to move
+ * @param the new bounds relative to the current position
+ * @param RepaintExposedAreaOnly
+ * if true Repaint only the expanded or contracted region,
+ * if false Repaint the union of the old and new rectangles.
+ */
+ void ResizeView(nsView *aView, const nsRect &aRect,
+ bool aRepaintExposedAreaOnly = false);
+
+ /**
+ * Set the visibility of a view. Hidden views have the effect of hiding
+ * their descendants as well. This does not affect painting, so layout
+ * is responsible for ensuring that content in hidden views is not
+ * painted nor handling events. It does affect the visibility of widgets;
+ * if a view is hidden, descendant views with widgets have their widgets
+ * hidden.
+ * The view manager generates the appropriate dirty regions.
+ * @param aView view to change visibility state of
+ * @param visible new visibility state
+ */
+ void SetViewVisibility(nsView *aView, nsViewVisibility aVisible);
+
+ /**
+ * Set the z-index of a view. Positive z-indices mean that a view
+ * is above its parent in z-order. Negative z-indices mean that a
+ * view is below its parent.
+ * The view manager generates the appropriate dirty regions.
+ * @param aAutoZIndex indicate that the z-index of a view is "auto". An "auto" z-index
+ * means that the view does not define a new stacking context,
+ * which means that the z-indicies of the view's children are
+ * relative to the view's siblings.
+ * @param aView view to change z depth of
+ * @param aZindex explicit z depth
+ */
+ void SetViewZIndex(nsView *aView, bool aAutoZIndex, int32_t aZindex);
+
+ /**
+ * Set whether the view "floats" above all other views,
+ * which tells the compositor not to consider higher views in
+ * the view hierarchy that would geometrically intersect with
+ * this view. This is a hack, but it fixes some problems with
+ * views that need to be drawn in front of all other views.
+ */
+ void SetViewFloating(nsView *aView, bool aFloatingView);
+
+ /**
+ * Set the presshell associated with this manager
+ * @param aPresShell - new presshell
+ */
+ void SetPresShell(nsIPresShell *aPresShell) { mPresShell = aPresShell; }
+
+ /**
+ * Get the pres shell associated with this manager
+ */
+ nsIPresShell* GetPresShell() { return mPresShell; }
+
+ /**
+ * Get the device context associated with this manager
+ */
+ nsDeviceContext* GetDeviceContext() const
+ {
+ return mContext;
+ }
+
+ /**
+ * A stack class for disallowing changes that would enter painting. For
+ * example, popup widgets shouldn't be resized during reflow, since doing so
+ * might cause synchronous painting inside reflow which is forbidden.
+ * While refresh is disabled, widget geometry changes are deferred and will
+ * be handled later, either from the refresh driver or from an NS_WILL_PAINT
+ * event.
+ * We don't want to defer widget geometry changes all the time. Resizing a
+ * popup from script doesn't need to be deferred, for example, especially
+ * since popup widget geometry is observable from script and expected to
+ * update synchronously.
+ */
+ class MOZ_STACK_CLASS AutoDisableRefresh {
+ public:
+ explicit AutoDisableRefresh(nsViewManager* aVM) {
+ if (aVM) {
+ mRootVM = aVM->IncrementDisableRefreshCount();
+ }
+ }
+ ~AutoDisableRefresh() {
+ if (mRootVM) {
+ mRootVM->DecrementDisableRefreshCount();
+ }
+ }
+ private:
+ AutoDisableRefresh(const AutoDisableRefresh& aOther);
+ const AutoDisableRefresh& operator=(const AutoDisableRefresh& aOther);
+
+ RefPtr<nsViewManager> mRootVM;
+ };
+
+private:
+ friend class AutoDisableRefresh;
+
+ nsViewManager* IncrementDisableRefreshCount();
+ void DecrementDisableRefreshCount();
+
+public:
+ /**
+ * Retrieve the widget at the root of the nearest enclosing
+ * view manager whose root view has a widget.
+ */
+ void GetRootWidget(nsIWidget **aWidget);
+
+ /**
+ * Indicate whether the viewmanager is currently painting
+ *
+ * @param aPainting true if the viewmanager is painting
+ * false otherwise
+ */
+ void IsPainting(bool& aIsPainting);
+
+ /**
+ * Retrieve the time of the last user event. User events
+ * include mouse and keyboard events. The viewmanager
+ * saves the time of the last user event.
+ *
+ * @param aTime Last user event time in microseconds
+ */
+ void GetLastUserEventTime(uint32_t& aTime);
+
+ /**
+ * Find the nearest display root view for the view aView. This is the view for
+ * the nearest enclosing popup or the root view for the root document.
+ */
+ static nsView* GetDisplayRootFor(nsView* aView);
+
+ /**
+ * Flush the accumulated dirty region to the widget and update widget
+ * geometry.
+ */
+ void ProcessPendingUpdates();
+
+ /**
+ * Just update widget geometry without flushing the dirty region
+ */
+ void UpdateWidgetGeometry();
+
+ int32_t AppUnitsPerDevPixel() const
+ {
+ return mContext->AppUnitsPerDevPixel();
+ }
+
+private:
+ static uint32_t gLastUserEventTime;
+
+ /* Update the cached RootViewManager pointer on this view manager. */
+ void InvalidateHierarchy();
+ void FlushPendingInvalidates();
+
+ void ProcessPendingUpdatesForView(nsView *aView,
+ bool aFlushDirtyRegion = true);
+ void ProcessPendingUpdatesRecurse(nsView* aView,
+ nsTArray<nsCOMPtr<nsIWidget> >& aWidgets);
+ void ProcessPendingUpdatesPaint(nsIWidget* aWidget);
+
+ void FlushDirtyRegionToWidget(nsView* aView);
+ /**
+ * Call WillPaint() on all view observers under this vm root.
+ */
+ void CallWillPaintOnObservers();
+ void ReparentChildWidgets(nsView* aView, nsIWidget *aNewWidget);
+ void ReparentWidgets(nsView* aView, nsView *aParent);
+ void InvalidateWidgetArea(nsView *aWidgetView, const nsRegion &aDamagedRegion);
+
+ void InvalidateViews(nsView *aView);
+
+ // aView is the view for aWidget and aRegion is relative to aWidget.
+ void Refresh(nsView* aView, const LayoutDeviceIntRegion& aRegion);
+
+ // Utilities
+
+ bool IsViewInserted(nsView *aView);
+
+ /**
+ * Intersects aRect with aView's bounds and then transforms it from aView's
+ * coordinate system to the coordinate system of the widget attached to
+ * aView.
+ */
+ LayoutDeviceIntRect ViewToWidget(nsView* aView, const nsRect& aRect) const;
+
+ void DoSetWindowDimensions(nscoord aWidth, nscoord aHeight);
+ bool ShouldDelayResize() const;
+
+ bool IsPainting() const {
+ return RootViewManager()->mPainting;
+ }
+
+ void SetPainting(bool aPainting) {
+ RootViewManager()->mPainting = aPainting;
+ }
+
+ void InvalidateView(nsView *aView, const nsRect &aRect);
+
+ nsViewManager* RootViewManager() const { return mRootViewManager; }
+ bool IsRootVM() const { return this == RootViewManager(); }
+
+ // Whether synchronous painting is allowed at the moment. For example,
+ // widget geometry changes can cause synchronous painting, so they need to
+ // be deferred while refresh is disabled.
+ bool IsPaintingAllowed() { return RootViewManager()->mRefreshDisableCount == 0; }
+
+ void WillPaintWindow(nsIWidget* aWidget);
+ bool PaintWindow(nsIWidget* aWidget, LayoutDeviceIntRegion aRegion);
+ void DidPaintWindow();
+
+ // Call this when you need to let the viewmanager know that it now has
+ // pending updates.
+ void PostPendingUpdate();
+
+ RefPtr<nsDeviceContext> mContext;
+ nsIPresShell *mPresShell;
+
+ // The size for a resize that we delayed until the root view becomes
+ // visible again.
+ nsSize mDelayedResize;
+
+ nsView *mRootView;
+ // mRootViewManager is a strong ref unless it equals |this|. It's
+ // never null (if we have no ancestors, it will be |this|).
+ nsViewManager *mRootViewManager;
+
+ // The following members should not be accessed directly except by
+ // the root view manager. Some have accessor functions to enforce
+ // this, as noted.
+
+ int32_t mRefreshDisableCount;
+ // Use IsPainting() and SetPainting() to access mPainting.
+ bool mPainting;
+ bool mRecursiveRefreshPending;
+ bool mHasPendingWidgetGeometryChanges;
+
+ //from here to public should be static and locked... MMP
+
+ //list of view managers
+ static nsTArray<nsViewManager*> *gViewManagers;
+};
+
+/**
+ Invalidation model:
+
+ 1) Callers call into the view manager and ask it to invalidate a view.
+
+ 2) The view manager finds the "right" widget for the view, henceforth called
+ the root widget.
+
+ 3) The view manager traverses descendants of the root widget and for each
+ one that needs invalidation stores the rect to invalidate on the widget's
+ view (batching).
+
+ 4) The dirty region is flushed to the right widget when
+ ProcessPendingUpdates is called from the RefreshDriver.
+
+ It's important to note that widgets associated to views outside this view
+ manager can end up being invalidated during step 3. Therefore, the end of a
+ view update batch really needs to traverse the entire view tree, to ensure
+ that those invalidates happen.
+
+ To cope with this, invalidation processing and should only happen on the
+ root viewmanager.
+*/
+
+#endif // nsViewManager_h___