The Tor Browser: layout/generic/nsLeafFrame.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 /* base class for rendering objects that do not have child lists */

     8 #ifndef nsLeafFrame_h___

     9 #define nsLeafFrame_h___

    11 #include "mozilla/Attributes.h"

    12 #include "nsFrame.h"

    13 #include "nsDisplayList.h"

    15 /**

    16  * Abstract class that provides simple fixed-size layout for leaf objects

    17  * (e.g. images, form elements, etc.). Deriviations provide the implementation

    18  * of the GetDesiredSize method. The rendering method knows how to render

    19  * borders and backgrounds.

    20  */

    21 class nsLeafFrame : public nsFrame {

    22 public:

    23   NS_DECL_FRAMEARENA_HELPERS

    25   // nsIFrame replacements

    26   virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,

    27                                 const nsRect&           aDirtyRect,

    28                                 const nsDisplayListSet& aLists) MOZ_OVERRIDE {

    29     DO_GLOBAL_REFLOW_COUNT_DSP("nsLeafFrame");

    30     DisplayBorderBackgroundOutline(aBuilder, aLists);

    31   }

    33   /**

    34    * Both GetMinWidth and GetPrefWidth will return whatever GetIntrinsicWidth

    35    * returns.

    36    */

    37   virtual nscoord GetMinWidth(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;

    38   virtual nscoord GetPrefWidth(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;

    40   /**

    41    * Our auto size is just intrinsic width and intrinsic height.

    42    */

    43   virtual nsSize ComputeAutoSize(nsRenderingContext *aRenderingContext,

    44                                  nsSize aCBSize, nscoord aAvailableWidth,

    45                                  nsSize aMargin, nsSize aBorder,

    46                                  nsSize aPadding, bool aShrinkWrap) MOZ_OVERRIDE;

    48   /**

    49    * Reflow our frame.  This will use the computed width plus borderpadding for

    50    * the desired width, and use the return value of GetIntrinsicHeight plus

    51    * borderpadding for the desired height.  Ascent will be set to the height,

    52    * and descent will be set to 0.

    53    */

    54   virtual nsresult Reflow(nsPresContext*      aPresContext,

    55                           nsHTMLReflowMetrics& aDesiredSize,

    56                           const nsHTMLReflowState& aReflowState,

    57                           nsReflowStatus&      aStatus) MOZ_OVERRIDE;

    59   /**

    60    * This method does most of the work that Reflow() above need done.

    61    */

    62   virtual nsresult DoReflow(nsPresContext*      aPresContext,

    63                             nsHTMLReflowMetrics& aDesiredSize,

    64                             const nsHTMLReflowState& aReflowState,

    65                             nsReflowStatus&      aStatus);

    67   virtual bool IsFrameOfType(uint32_t aFlags) const MOZ_OVERRIDE

    68   {

    69     // We don't actually contain a block, but we do always want a

    70     // computed width, so tell a little white lie here.

    71     return nsFrame::IsFrameOfType(aFlags & ~(nsIFrame::eReplacedContainsBlock));

    72   }

    74 protected:

    75   nsLeafFrame(nsStyleContext* aContext) : nsFrame(aContext) {}

    76   virtual ~nsLeafFrame();

    78   /**

    79    * Return the intrinsic width of the frame's content area. Note that this

    80    * should not include borders or padding and should not depend on the applied

    81    * styles.

    82    */

    83   virtual nscoord GetIntrinsicWidth() = 0;

    85   /**

    86    * Return the intrinsic height of the frame's content area.  This should not

    87    * include border or padding.  This will only matter if the specified height

    88    * is auto.  Note that subclasses must either implement this or override

    89    * Reflow and ComputeAutoSize; the default Reflow and ComputeAutoSize impls

    90    * call this method.

    91    */

    92   virtual nscoord GetIntrinsicHeight();

    94   /**

    95    * Subroutine to add in borders and padding

    96    */

    97   void AddBordersAndPadding(const nsHTMLReflowState& aReflowState,

    98                             nsHTMLReflowMetrics& aDesiredSize);

   100   /**

   101    * Set aDesiredSize to be the available size

   102    */

   103   void SizeToAvailSize(const nsHTMLReflowState& aReflowState,

   104                        nsHTMLReflowMetrics& aDesiredSize);

   105 };

   107 #endif /* nsLeafFrame_h___ */

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