1 files changed, 106 insertions, 0 deletions
diff --git a/layout/generic/nsLeafFrame.h b/layout/generic/nsLeafFrame.h
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+++ b/layout/generic/nsLeafFrame.h
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+/* -*- 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/. */
+
+/* base class for rendering objects that do not have child lists */
+
+#ifndef nsLeafFrame_h___
+#define nsLeafFrame_h___
+
+#include "mozilla/Attributes.h"
+#include "nsFrame.h"
+#include "nsDisplayList.h"
+
+/**
+ * Abstract class that provides simple fixed-size layout for leaf objects
+ * (e.g. images, form elements, etc.). Deriviations provide the implementation
+ * of the GetDesiredSize method. The rendering method knows how to render
+ * borders and backgrounds.
+ */
+class nsLeafFrame : public nsFrame {
+public:
+  NS_DECL_ABSTRACT_FRAME(nsLeafFrame)
+
+  // nsIFrame replacements
+  virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
+                                const nsRect&           aDirtyRect,
+                                const nsDisplayListSet& aLists) override {
+    DO_GLOBAL_REFLOW_COUNT_DSP("nsLeafFrame");
+    DisplayBorderBackgroundOutline(aBuilder, aLists);
+  }
+
+  /**
+   * Both GetMinISize and GetPrefISize will return whatever GetIntrinsicISize
+   * returns.
+   */
+  virtual nscoord GetMinISize(nsRenderingContext *aRenderingContext) override;
+  virtual nscoord GetPrefISize(nsRenderingContext *aRenderingContext) override;
+
+  /**
+   * Our auto size is just intrinsic width and intrinsic height.
+   */
+  virtual mozilla::LogicalSize
+  ComputeAutoSize(nsRenderingContext*         aRenderingContext,
+                  mozilla::WritingMode        aWM,
+                  const mozilla::LogicalSize& aCBSize,
+                  nscoord                     aAvailableISize,
+                  const mozilla::LogicalSize& aMargin,
+                  const mozilla::LogicalSize& aBorder,
+                  const mozilla::LogicalSize& aPadding,
+                  ComputeSizeFlags            aFlags) override;
+
+  /**
+   * Reflow our frame.  This will use the computed width plus borderpadding for
+   * the desired width, and use the return value of GetIntrinsicBSize plus
+   * borderpadding for the desired height.  Ascent will be set to the height,
+   * and descent will be set to 0.
+   */
+  virtual void Reflow(nsPresContext*      aPresContext,
+                      ReflowOutput& aDesiredSize,
+                      const ReflowInput& aReflowInput,
+                      nsReflowStatus&      aStatus) override;
+  
+  /**
+   * This method does most of the work that Reflow() above need done.
+   */
+  virtual void DoReflow(nsPresContext*      aPresContext,
+                        ReflowOutput& aDesiredSize,
+                        const ReflowInput& aReflowInput,
+                        nsReflowStatus&      aStatus);
+
+  virtual bool IsFrameOfType(uint32_t aFlags) const override
+  {
+    // We don't actually contain a block, but we do always want a
+    // computed width, so tell a little white lie here.
+    return nsFrame::IsFrameOfType(aFlags & ~(nsIFrame::eReplacedContainsBlock));
+  }
+
+protected:
+  explicit nsLeafFrame(nsStyleContext* aContext) : nsFrame(aContext) {}
+  virtual ~nsLeafFrame();
+
+  /**
+   * Return the intrinsic isize of the frame's content area. Note that this
+   * should not include borders or padding and should not depend on the applied
+   * styles.
+   */
+  virtual nscoord GetIntrinsicISize() = 0;
+
+  /**
+   * Return the intrinsic bsize of the frame's content area.  This should not
+   * include border or padding.  This will only matter if the specified bsize
+   * is auto.  Note that subclasses must either implement this or override
+   * Reflow and ComputeAutoSize; the default Reflow and ComputeAutoSize impls
+   * call this method.
+   */
+  virtual nscoord GetIntrinsicBSize();
+
+  /**
+   * Set aDesiredSize to be the available size
+   */
+  void SizeToAvailSize(const ReflowInput& aReflowInput,
+                       ReflowOutput& aDesiredSize);
+};
+
+#endif /* nsLeafFrame_h___ */