1/*
2 * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
3 *           (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB.  If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 *
20 */
21
22#ifndef RenderTextControl_h
23#define RenderTextControl_h
24
25#include "core/rendering/RenderBlockFlow.h"
26#include "core/rendering/RenderFlexibleBox.h"
27
28namespace blink {
29
30class HTMLTextFormControlElement;
31
32class RenderTextControl : public RenderBlockFlow {
33public:
34    virtual ~RenderTextControl();
35
36    HTMLTextFormControlElement* textFormControlElement() const;
37    virtual PassRefPtr<RenderStyle> createInnerEditorStyle(const RenderStyle* startStyle) const = 0;
38
39protected:
40    RenderTextControl(HTMLTextFormControlElement*);
41
42    // This convenience function should not be made public because
43    // innerEditorElement may outlive the render tree.
44    HTMLElement* innerEditorElement() const;
45
46    int scrollbarThickness() const;
47    void adjustInnerEditorStyle(RenderStyle* textBlockStyle) const;
48
49    virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE;
50
51    void hitInnerEditorElement(HitTestResult&, const LayoutPoint& pointInContainer, const LayoutPoint& accumulatedOffset);
52
53    int textBlockLogicalWidth() const;
54    int textBlockLogicalHeight() const;
55
56    float scaleEmToUnits(int x) const;
57
58    static bool hasValidAvgCharWidth(AtomicString family);
59    virtual float getAvgCharWidth(AtomicString family);
60    virtual LayoutUnit preferredContentLogicalWidth(float charWidth) const = 0;
61    virtual LayoutUnit computeControlLogicalHeight(LayoutUnit lineHeight, LayoutUnit nonContentHeight) const = 0;
62
63    virtual void updateFromElement() OVERRIDE;
64    virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const OVERRIDE;
65    virtual RenderObject* layoutSpecialExcludedChild(bool relayoutChildren, SubtreeLayoutScope&) OVERRIDE;
66
67    // We need to override this function because we don't want overflow:hidden on an <input>
68    // to affect the baseline calculation. This is necessary because we are an inline-block
69    // element as an implementation detail which would normally be affected by this.
70    virtual int inlineBlockBaseline(LineDirectionMode direction) const OVERRIDE { return lastLineBoxBaseline(direction); }
71
72private:
73    virtual const char* renderName() const OVERRIDE { return "RenderTextControl"; }
74    virtual bool isTextControl() const OVERRIDE FINAL { return true; }
75    virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const OVERRIDE FINAL;
76    virtual void computePreferredLogicalWidths() OVERRIDE FINAL;
77    virtual void removeLeftoverAnonymousBlock(RenderBlock*) OVERRIDE FINAL { }
78    virtual bool avoidsFloats() const OVERRIDE FINAL { return true; }
79    virtual bool canHaveGeneratedChildren() const OVERRIDE FINAL { return false; }
80
81    virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0) OVERRIDE FINAL;
82
83    virtual void addFocusRingRects(Vector<LayoutRect>&, const LayoutPoint& additionalOffset, const RenderLayerModelObject* paintContainer) const OVERRIDE FINAL;
84
85    virtual bool canBeProgramaticallyScrolled() const OVERRIDE FINAL { return true; }
86};
87
88DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderTextControl, isTextControl());
89
90// Renderer for our inner container, for <search> and others.
91// We can't use RenderFlexibleBox directly, because flexboxes have a different
92// baseline definition, and then inputs of different types wouldn't line up
93// anymore.
94class RenderTextControlInnerContainer FINAL : public RenderFlexibleBox {
95public:
96    explicit RenderTextControlInnerContainer(Element* element)
97        : RenderFlexibleBox(element)
98    { }
99    virtual ~RenderTextControlInnerContainer() { }
100
101    virtual int baselinePosition(FontBaseline baseline, bool firstLine, LineDirectionMode direction, LinePositionMode position) const OVERRIDE
102    {
103        return RenderBlock::baselinePosition(baseline, firstLine, direction, position);
104    }
105    virtual int firstLineBoxBaseline() const OVERRIDE { return RenderBlock::firstLineBoxBaseline(); }
106    virtual int inlineBlockBaseline(LineDirectionMode direction) const OVERRIDE { return lastLineBoxBaseline(direction); }
107};
108
109
110} // namespace blink
111
112#endif // RenderTextControl_h
113