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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "nsIFrame.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 nsIFrame {
+ public:
+ NS_DECL_ABSTRACT_FRAME(nsLeafFrame)
+
+ // nsIFrame replacements
+ void BuildDisplayList(nsDisplayListBuilder* aBuilder,
+ const nsDisplayListSet& aLists) override;
+
+ /**
+ * Both GetMinISize and GetPrefISize will return whatever GetIntrinsicISize
+ * returns.
+ */
+ virtual nscoord GetMinISize(gfxContext* aRenderingContext) override;
+ virtual nscoord GetPrefISize(gfxContext* aRenderingContext) override;
+
+ /**
+ * Our auto size is just intrinsic width and intrinsic height.
+ */
+ mozilla::LogicalSize ComputeAutoSize(
+ gfxContext* aRenderingContext, mozilla::WritingMode aWM,
+ const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
+ const mozilla::LogicalSize& aMargin,
+ const mozilla::LogicalSize& aBorderPadding,
+ const mozilla::StyleSizeOverrides& aSizeOverrides,
+ mozilla::ComputeSizeFlags aFlags) override;
+
+ /**
+ * Each of our subclasses should provide its own Reflow impl:
+ */
+ virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
+ const ReflowInput& aReflowInput,
+ nsReflowStatus& aStatus) override = 0;
+
+ 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 nsIFrame::IsFrameOfType(aFlags &
+ ~(nsIFrame::eReplacedContainsBlock));
+ }
+
+ protected:
+ nsLeafFrame(ComputedStyle* aStyle, nsPresContext* aPresContext, ClassID aID)
+ : nsIFrame(aStyle, aPresContext, aID) {}
+
+ 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___ */