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      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/RenderBlock.h"
     26 #include "core/rendering/RenderFlexibleBox.h"
     27 
     28 namespace WebCore {
     29 
     30 class HTMLTextFormControlElement;
     31 
     32 class RenderTextControl : public RenderBlock {
     33 public:
     34     virtual ~RenderTextControl();
     35 
     36     HTMLTextFormControlElement* textFormControlElement() const;
     37     virtual PassRefPtr<RenderStyle> createInnerTextStyle(const RenderStyle* startStyle) const = 0;
     38 
     39 protected:
     40     RenderTextControl(HTMLTextFormControlElement*);
     41 
     42     // This convenience function should not be made public because innerTextElement may outlive the render tree.
     43     HTMLElement* innerTextElement() const;
     44 
     45     int scrollbarThickness() const;
     46     void adjustInnerTextStyle(RenderStyle* textBlockStyle) const;
     47 
     48     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
     49 
     50     void hitInnerTextElement(HitTestResult&, const LayoutPoint& pointInContainer, const LayoutPoint& accumulatedOffset);
     51 
     52     int textBlockLogicalWidth() const;
     53     int textBlockLogicalHeight() const;
     54 
     55     float scaleEmToUnits(int x) const;
     56 
     57     static bool hasValidAvgCharWidth(AtomicString family);
     58     virtual float getAvgCharWidth(AtomicString family);
     59     virtual LayoutUnit preferredContentLogicalWidth(float charWidth) const = 0;
     60     virtual LayoutUnit computeControlLogicalHeight(LayoutUnit lineHeight, LayoutUnit nonContentHeight) const = 0;
     61     virtual RenderStyle* textBaseStyle() const = 0;
     62 
     63     virtual void updateFromElement();
     64     virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const OVERRIDE;
     65     virtual RenderObject* layoutSpecialExcludedChild(bool relayoutChildren);
     66 
     67 private:
     68     virtual const char* renderName() const { return "RenderTextControl"; }
     69     virtual bool isTextControl() const { return true; }
     70     virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const OVERRIDE;
     71     virtual void computePreferredLogicalWidths() OVERRIDE;
     72     virtual void removeLeftoverAnonymousBlock(RenderBlock*) { }
     73     virtual bool avoidsFloats() const { return true; }
     74     virtual bool canHaveGeneratedChildren() const OVERRIDE { return false; }
     75     virtual bool canBeReplacedWithInlineRunIn() const OVERRIDE;
     76 
     77     virtual void addFocusRingRects(Vector<IntRect>&, const LayoutPoint& additionalOffset, const RenderLayerModelObject* paintContainer = 0) OVERRIDE;
     78 
     79     virtual bool canBeProgramaticallyScrolled() const { return true; }
     80 
     81     virtual bool requiresForcedStyleRecalcPropagation() const { return true; }
     82 };
     83 
     84 inline RenderTextControl* toRenderTextControl(RenderObject* object)
     85 {
     86     ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isTextControl());
     87     return static_cast<RenderTextControl*>(object);
     88 }
     89 
     90 inline const RenderTextControl* toRenderTextControl(const RenderObject* object)
     91 {
     92     ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isTextControl());
     93     return static_cast<const RenderTextControl*>(object);
     94 }
     95 
     96 // This will catch anyone doing an unnecessary cast.
     97 void toRenderTextControl(const RenderTextControl*);
     98 
     99 // Renderer for our inner container, for <search> and others.
    100 // We can't use RenderFlexibleBox directly, because flexboxes have a different
    101 // baseline definition, and then inputs of different types wouldn't line up
    102 // anymore.
    103 class RenderTextControlInnerContainer FINAL : public RenderFlexibleBox {
    104 public:
    105     explicit RenderTextControlInnerContainer(Element* element)
    106         : RenderFlexibleBox(element)
    107     { }
    108     virtual ~RenderTextControlInnerContainer() { }
    109 
    110     virtual int baselinePosition(FontBaseline baseline, bool firstLine, LineDirectionMode direction, LinePositionMode position) const OVERRIDE
    111     {
    112         return RenderBlock::baselinePosition(baseline, firstLine, direction, position);
    113     }
    114     virtual int firstLineBoxBaseline() const OVERRIDE { return RenderBlock::firstLineBoxBaseline(); }
    115     virtual int inlineBlockBaseline(LineDirectionMode direction) const OVERRIDE { return lastLineBoxBaseline(direction); }
    116 
    117 };
    118 
    119 
    120 } // namespace WebCore
    121 
    122 #endif // RenderTextControl_h
    123