Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 568 insertions, 0 deletions

diff --git a/view/nsView.h b/view/nsView.h
new file mode 100644
index 0000000000..832c6358ad
--- /dev/null
+++ b/view/nsView.h
@@ -0,0 +1,568 @@
+/* -*- 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 nsView_h__
+#define nsView_h__
+
+#include "nsCoord.h"
+#include "nsRect.h"
+#include "nsPoint.h"
+#include "nsRegion.h"
+#include "nsCRT.h"
+#include "nsCOMPtr.h"
+#include "nsIWidgetListener.h"
+#include "Units.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/EventForwards.h"
+#include "mozilla/UniquePtr.h"
+
+class nsViewManager;
+class nsIWidget;
+class nsIFrame;
+
+namespace mozilla {
+class PresShell;
+namespace widget {
+struct InitData;
+enum class TransparencyMode : uint8_t;
+enum class WindowType : uint8_t;
+}  // namespace widget
+}  // namespace mozilla
+
+/**
+ * nsView's serve two main purposes: 1) a bridge between nsIFrame's and
+ * nsIWidget's, 2) linking the frame tree of a(n) (in-process) subdocument with
+ * its parent document frame tree. Historically views were used for more things,
+ * but their role has been reduced, and could be reduced to nothing in the
+ * future (bug 337801 tracks removing views). Views are generally associated
+ * with a frame. A view that does not have a frame is called an anonymous view.
+ * Some frames also have associated widgets (think os level windows). If a frame
+ * has a widget it must also have a view, but not all frames with views will
+ * have widgets.
+ *
+ * Only four types of frames can have a view: root frames (ViewportFrame),
+ * subdocument frames (nsSubDocumentFrame),
+ * menu popup frames (nsMenuPopupFrame), and list control frames
+ * (nsListControlFrame). Root frames and subdocument frames have views to link
+ * the two documents together (the frame trees do not link up otherwise).
+ * Menu popup frames, and list control frames have views because
+ * they (sometimes) need to create widgets.
+ * Menu popup frames handles xul popups, which is anything
+ * where we need content to go over top the main window at an os level. List
+ * control frames handle select popups/dropdowns in non-e10s mode.
+ *
+ * The term "root view" refers to the root view of a document. Just like root
+ * frames, root views can have parent views. Only the root view of the root
+ * document in the process will not have a parent.
+ *
+ * All views are created by their frames except root views. Root views are
+ * special. Root views are created in nsDocumentViewer::MakeWindow before the
+ * root frame is created, so the root view will not have a frame very early in
+ * document creation.
+ *
+ * Subdocument frames have an anonymous (no frame associated
+ * with it) inner view that is a child of their "outer" view.
+ *
+ * On a subdocument frame the inner view serves as the parent of the
+ * root view of the subdocument. The outer and inner view of the subdocument
+ * frame belong to the subdocument frame and hence to the parent document. The
+ * root view of the subdocument belongs to the subdocument.
+ * nsLayoutUtils::GetCrossDocParentFrame and nsPresContext::GetParentPresContext
+ * depend on this view structure and are the main way that we traverse across
+ * the document boundary in layout.
+ *
+ * When the load of a new document is started in the subdocument, the creation
+ * of the new subdocument and destruction of the old subdocument are not
+ * linked. (This creation and destruction is handled in nsDocumentViewer.cpp.)
+ * This means that the old and new document will both exist at the same time
+ * during the loading of the new document. During this period the inner view of
+ * the subdocument parent will be the parent of two root views. This means that
+ * during this period there is a choice for which subdocument we draw,
+ * nsSubDocumentFrame::GetSubdocumentPresShellForPainting is what makes that
+ * choice. Note that this might not be a totally free choice, ie there might be
+ * hidden dependencies and bugs if the way we choose is changed.
+ *
+ * One thing that is special about the root view of a chrome window is that
+ * instead of creating a widget for the view, they can "attach" to the
+ * existing widget that was created by appshell code or something else. (see
+ * nsDocumentViewer::ShouldAttachToTopLevel)
+ */
+
+// Enumerated type to indicate the visibility of a layer.
+// hide - the layer is not shown.
+// show - the layer is shown irrespective of the visibility of
+//        the layer's parent.
+enum class ViewVisibility : uint8_t { Hide = 0, Show = 1 };
+
+// Public view flags
+
+// Indicates that the view is using auto z-indexing
+#define NS_VIEW_FLAG_AUTO_ZINDEX 0x0004
+
+// Indicates that the view is a floating view.
+#define NS_VIEW_FLAG_FLOATING 0x0008
+
+//----------------------------------------------------------------------
+
+/**
+ * View interface
+ *
+ * Views are NOT reference counted. Use the Destroy() member function to
+ * destroy a view.
+ *
+ * The lifetime of the view hierarchy is bounded by the lifetime of the
+ * view manager that owns the views.
+ *
+ * Most of the methods here are read-only. To set the corresponding properties
+ * of a view, go through nsViewManager.
+ */
+
+class nsView final : public nsIWidgetListener {
+ public:
+  friend class nsViewManager;
+
+  typedef mozilla::LayoutDeviceIntRect LayoutDeviceIntRect;
+  typedef mozilla::LayoutDeviceIntRegion LayoutDeviceIntRegion;
+
+  void operator delete(void* ptr) { ::operator delete(ptr); }
+
+  /**
+   * Get the view manager which "owns" the view.
+   * This method might require some expensive traversal work in the future. If
+   * you can get the view manager from somewhere else, do that instead.
+   * @result the view manager
+   */
+  nsViewManager* GetViewManager() const { return mViewManager; }
+
+  /**
+   * Find the view for the given widget, if there is one.
+   * @return the view the widget belongs to, or null if the widget doesn't
+   * belong to any view.
+   */
+  static nsView* GetViewFor(const nsIWidget* aWidget);
+
+  /**
+   * Destroy the view.
+   *
+   * The view destroys its child views, and destroys and releases its
+   * widget (if it has one).
+   *
+   * Also informs the view manager that the view is destroyed by calling
+   * SetRootView(NULL) if the view is the root view and calling RemoveChild()
+   * otherwise.
+   */
+  void Destroy();
+
+  /**
+   * Called to get the position of a view.
+   * The specified coordinates are relative to the parent view's origin, but
+   * are in appunits of this.
+   * This is the (0, 0) origin of the coordinate space established by this view.
+   * @param x out parameter for x position
+   * @param y out parameter for y position
+   */
+  nsPoint GetPosition() const {
+    NS_ASSERTION(!IsRoot() || (mPosX == 0 && mPosY == 0),
+                 "root views should always have explicit position of (0,0)");
+    return nsPoint(mPosX, mPosY);
+  }
+
+  /**
+   * Called to get the dimensions and position of the view's bounds.
+   * The view's bounds (x,y) are relative to the origin of the parent view, but
+   * are in appunits of this.
+   * The view's bounds (x,y) might not be the same as the view's position,
+   * if the view has content above or to the left of its origin.
+   * @param aBounds out parameter for bounds
+   */
+  nsRect GetBounds() const { return mDimBounds; }
+
+  /**
+   * The bounds of this view relative to this view. So this is the same as
+   * GetBounds except this is relative to this view instead of the parent view.
+   */
+  nsRect GetDimensions() const {
+    nsRect r = mDimBounds;
+    r.MoveBy(-mPosX, -mPosY);
+    return r;
+  }
+
+  /**
+   * Get the offset between the coordinate systems of |this| and aOther.
+   * Adding the return value to a point in the coordinate system of |this|
+   * will transform the point to the coordinate system of aOther.
+   *
+   * The offset is expressed in appunits of |this|. So if you are getting the
+   * offset between views in different documents that might have different
+   * appunits per devpixel ratios you need to be careful how you use the
+   * result.
+   *
+   * If aOther is null, this will return the offset of |this| from the
+   * root of the viewmanager tree.
+   *
+   * This function is fastest when aOther is an ancestor of |this|.
+   *
+   * NOTE: this actually returns the offset from aOther to |this|, but
+   * that offset is added to transform _coordinates_ from |this| to aOther.
+   */
+  nsPoint GetOffsetTo(const nsView* aOther) const;
+
+  /**
+   * Get the offset between the origin of |this| and the origin of aWidget.
+   * Adding the return value to a point in the coordinate system of |this|
+   * will transform the point to the coordinate system of aWidget.
+   *
+   * The offset is expressed in appunits of |this|.
+   */
+  nsPoint GetOffsetToWidget(nsIWidget* aWidget) const;
+
+  /**
+   * Takes a point aPt that is in the coordinate system of |this|'s parent view
+   * and converts it to be in the coordinate system of |this| taking into
+   * account the offset and any app unit per dev pixel ratio differences.
+   */
+  nsPoint ConvertFromParentCoords(nsPoint aPt) const;
+
+  /**
+   * Called to query the visibility state of a view.
+   * @result current visibility state
+   */
+  ViewVisibility GetVisibility() const { return mVis; }
+
+  /**
+   * Get 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.
+   * @result true if the view floats, false otherwise.
+   */
+  bool GetFloating() const { return (mVFlags & NS_VIEW_FLAG_FLOATING) != 0; }
+
+  /**
+   * Called to query the parent of the view.
+   * @result view's parent
+   */
+  nsView* GetParent() const { return mParent; }
+
+  /**
+   * The view's first child is the child which is earliest in document order.
+   * @result first child
+   */
+  nsView* GetFirstChild() const { return mFirstChild; }
+
+  /**
+   * Called to query the next sibling of the view.
+   * @result view's next sibling
+   */
+  nsView* GetNextSibling() const { return mNextSibling; }
+
+  /**
+   * Set the view's frame.
+   */
+  void SetFrame(nsIFrame* aRootFrame) { mFrame = aRootFrame; }
+
+  /**
+   * Retrieve the view's frame.
+   */
+  nsIFrame* GetFrame() const { return mFrame; }
+
+  /**
+   * Get the nearest widget in this view or a parent of this view and
+   * the offset from the widget's origin to this view's origin
+   * @param aOffset - if non-null the offset from this view's origin to the
+   * widget's origin (usually positive) expressed in appunits of this will be
+   * returned in aOffset.
+   * @return the widget closest to this view; can be null because some view
+   * trees don't have widgets at all (e.g., printing), but if any view in the
+   * view tree has a widget, then it's safe to assume this will not return null
+   */
+  nsIWidget* GetNearestWidget(nsPoint* aOffset) const;
+
+  /**
+   * Create a widget to associate with this view.  This variant of
+   * CreateWidget*() will look around in the view hierarchy for an
+   * appropriate parent widget for the view.
+   *
+   * @param aWidgetInitData data used to initialize this view's widget before
+   *        its create is called.
+   * @return error status
+   */
+  nsresult CreateWidget(mozilla::widget::InitData* aWidgetInitData = nullptr,
+                        bool aEnableDragDrop = true,
+                        bool aResetVisibility = true);
+
+  /**
+   * Create a widget for this view with an explicit parent widget.
+   * |aParentWidget| must be nonnull.  The other params are the same
+   * as for |CreateWidget()|.
+   */
+  nsresult CreateWidgetForParent(nsIWidget* aParentWidget,
+                                 mozilla::widget::InitData* = nullptr,
+                                 bool aEnableDragDrop = true,
+                                 bool aResetVisibility = true);
+
+  /**
+   * Create a popup widget for this view.  Pass |aParentWidget| to
+   * explicitly set the popup's parent.  If it's not passed, the view
+   * hierarchy will be searched for an appropriate parent widget.  The
+   * other params are the same as for |CreateWidget()|, except that
+   * |aWidgetInitData| must be nonnull.
+   */
+  nsresult CreateWidgetForPopup(mozilla::widget::InitData*,
+                                nsIWidget* aParentWidget = nullptr);
+
+  /**
+   * Destroys the associated widget for this view.  If this method is
+   * not called explicitly, the widget when be destroyed when its
+   * view gets destroyed.
+   */
+  void DestroyWidget();
+
+  /**
+   * Attach/detach a top level widget from this view. When attached, the view
+   * updates the widget's device context and allows the view to begin receiving
+   * gecko events. The underlying base window associated with the widget will
+   * continues to receive events it expects.
+   *
+   * An attached widget will not be destroyed when the view is destroyed,
+   * allowing the recycling of a single top level widget over multiple views.
+   *
+   * @param aWidget The widget to attach to / detach from.
+   */
+  nsresult AttachToTopLevelWidget(nsIWidget* aWidget);
+  nsresult DetachFromTopLevelWidget();
+
+  /**
+   * Returns a flag indicating whether the view owns it's widget
+   * or is attached to an existing top level widget.
+   */
+  bool IsAttachedToTopLevel() const { return mWidgetIsTopLevel; }
+
+  /**
+   * In 4.0, the "cutout" nature of a view is queryable.
+   * If we believe that all cutout view have a native widget, this
+   * could be a replacement.
+   * @param aWidget out parameter for widget that this view contains,
+   *        or nullptr if there is none.
+   */
+  nsIWidget* GetWidget() const { return mWindow; }
+
+  /**
+   * The widget which we have attached a listener to can also have a "previous"
+   * listener set on it. This is to keep track of the last nsView when
+   * navigating to a new one so that we can continue to paint that if the new
+   * one isn't ready yet.
+   */
+  void SetPreviousWidget(nsIWidget* aWidget) { mPreviousWindow = aWidget; }
+
+  /**
+   * Returns true if the view has a widget associated with it.
+   */
+  bool HasWidget() const { return mWindow != nullptr; }
+
+  void SetForcedRepaint(bool aForceRepaint) { mForcedRepaint = aForceRepaint; }
+
+  void SetNeedsWindowPropertiesSync();
+
+  /**
+   * Make aWidget direct its events to this view.
+   * The caller must call DetachWidgetEventHandler before this view
+   * is destroyed.
+   */
+  void AttachWidgetEventHandler(nsIWidget* aWidget);
+  /**
+   * Stop aWidget directing its events to this view.
+   */
+  void DetachWidgetEventHandler(nsIWidget* aWidget);
+
+#ifdef DEBUG
+  /**
+   * Output debug info to FILE
+   * @param out output file handle
+   * @param aIndent indentation depth
+   * NOTE: virtual so that debugging tools not linked into gklayout can access
+   * it
+   */
+  virtual void List(FILE* out, int32_t aIndent = 0) const;
+#endif  // DEBUG
+
+  /**
+   * @result true iff this is the root view for its view manager
+   */
+  bool IsRoot() const;
+
+  LayoutDeviceIntRect CalcWidgetBounds(mozilla::widget::WindowType,
+                                       mozilla::widget::TransparencyMode);
+
+  LayoutDeviceIntRect RecalcWidgetBounds();
+
+  // This is an app unit offset to add when converting view coordinates to
+  // widget coordinates.  It is the offset in view coordinates from widget
+  // origin (unlike views, widgets can't extend above or to the left of their
+  // origin) to view origin expressed in appunits of this.
+  nsPoint ViewToWidgetOffset() const { return mViewToWidgetOffset; }
+
+  /**
+   * Called to indicate that the position of the view has been changed.
+   * The specified coordinates are in the parent view's coordinate space.
+   * @param x new x position
+   * @param y new y position
+   */
+  void SetPosition(nscoord aX, nscoord aY);
+
+  /**
+   * Called to indicate that the z-index of a view has been changed.
+   * The z-index is relative to all siblings of the view.
+   * @param aAuto 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 zindex new z depth
+   */
+  void SetZIndex(bool aAuto, int32_t aZIndex);
+  bool GetZIndexIsAuto() const {
+    return (mVFlags & NS_VIEW_FLAG_AUTO_ZINDEX) != 0;
+  }
+  int32_t GetZIndex() const { return mZIndex; }
+
+  void SetParent(nsView* aParent) { mParent = aParent; }
+  void SetNextSibling(nsView* aSibling) {
+    NS_ASSERTION(aSibling != this, "Can't be our own sibling!");
+    mNextSibling = aSibling;
+  }
+
+  nsRegion& GetDirtyRegion() {
+    if (!mDirtyRegion) {
+      NS_ASSERTION(!mParent || GetFloating(),
+                   "Only display roots should have dirty regions");
+      mDirtyRegion = mozilla::MakeUnique<nsRegion>();
+    }
+    return *mDirtyRegion;
+  }
+
+  // nsIWidgetListener
+  virtual mozilla::PresShell* GetPresShell() override;
+  virtual nsView* GetView() override { return this; }
+  virtual bool WindowMoved(nsIWidget* aWidget, int32_t x, int32_t y,
+                           ByMoveToRect) override;
+  virtual bool WindowResized(nsIWidget* aWidget, int32_t aWidth,
+                             int32_t aHeight) override;
+#if defined(MOZ_WIDGET_ANDROID)
+  virtual void DynamicToolbarMaxHeightChanged(
+      mozilla::ScreenIntCoord aHeight) override;
+  virtual void DynamicToolbarOffsetChanged(
+      mozilla::ScreenIntCoord aOffset) override;
+#endif
+  virtual bool RequestWindowClose(nsIWidget* aWidget) override;
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY
+  virtual void WillPaintWindow(nsIWidget* aWidget) override;
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY
+  virtual bool PaintWindow(nsIWidget* aWidget,
+                           LayoutDeviceIntRegion aRegion) override;
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY
+  virtual void DidPaintWindow() override;
+  virtual void DidCompositeWindow(
+      mozilla::layers::TransactionId aTransactionId,
+      const mozilla::TimeStamp& aCompositeStart,
+      const mozilla::TimeStamp& aCompositeEnd) override;
+  virtual void RequestRepaint() override;
+  virtual bool ShouldNotBeVisible() override;
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY
+  virtual nsEventStatus HandleEvent(mozilla::WidgetGUIEvent* aEvent,
+                                    bool aUseAttachedEvents) override;
+  virtual void SafeAreaInsetsChanged(const mozilla::ScreenIntMargin&) override;
+
+  virtual ~nsView();
+
+  nsPoint GetOffsetTo(const nsView* aOther, const int32_t aAPD) const;
+  nsIWidget* GetNearestWidget(nsPoint* aOffset, const int32_t aAPD) const;
+
+  bool IsPrimaryFramePaintSuppressed();
+
+ private:
+  explicit nsView(nsViewManager* = nullptr,
+                  ViewVisibility = ViewVisibility::Show);
+
+  bool ForcedRepaint() { return mForcedRepaint; }
+
+  // Do the actual work of ResetWidgetBounds, unconditionally.  Don't
+  // call this method if we have no widget.
+  void DoResetWidgetBounds(bool aMoveOnly, bool aInvalidateChangedSize);
+  void InitializeWindow(bool aEnableDragDrop, bool aResetVisibility);
+
+  bool IsEffectivelyVisible();
+
+  /**
+   * Called to indicate that the dimensions of the view have been changed.
+   * The x and y coordinates may be < 0, indicating that the view extends above
+   * or to the left of its origin position. The term 'dimensions' indicates it
+   * is relative to this view.
+   */
+  void SetDimensions(const nsRect& aRect, bool aPaint = true,
+                     bool aResizeWidget = true);
+
+  /**
+   * Called to indicate that the visibility of a view has been
+   * changed.
+   * @param visibility new visibility state
+   */
+  void SetVisibility(ViewVisibility visibility);
+
+  /**
+   * Set/Get 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.
+   * @result true if the view floats, false otherwise.
+   */
+  void SetFloating(bool aFloatingView);
+
+  // Helper function to get mouse grabbing off this view (by moving it to the
+  // parent, if we can)
+  void DropMouseGrabbing();
+
+  // Same as GetBounds but converts to parent appunits if they are different.
+  nsRect GetBoundsInParentUnits() const;
+
+  bool HasNonEmptyDirtyRegion() {
+    return mDirtyRegion && !mDirtyRegion->IsEmpty();
+  }
+
+  void InsertChild(nsView* aChild, nsView* aSibling);
+  void RemoveChild(nsView* aChild);
+
+  void ResetWidgetBounds(bool aRecurse, bool aForceSync);
+  void AssertNoWindow();
+
+  void NotifyEffectiveVisibilityChanged(bool aEffectivelyVisible);
+
+  // Update the cached RootViewManager for all view manager descendents.
+  void InvalidateHierarchy();
+
+  nsViewManager* mViewManager;
+  nsView* mParent;
+  nsCOMPtr<nsIWidget> mWindow;
+  nsCOMPtr<nsIWidget> mPreviousWindow;
+  nsView* mNextSibling;
+  nsView* mFirstChild;
+  nsIFrame* mFrame;
+  mozilla::UniquePtr<nsRegion> mDirtyRegion;
+  int32_t mZIndex;
+  ViewVisibility mVis;
+  // position relative our parent view origin but in our appunits
+  nscoord mPosX, mPosY;
+  // relative to parent, but in our appunits
+  nsRect mDimBounds;
+  // in our appunits
+  nsPoint mViewToWidgetOffset;
+  uint32_t mVFlags;
+  bool mWidgetIsTopLevel;
+  bool mForcedRepaint;
+  bool mNeedsWindowPropertiesSync;
+};
+
+#endif