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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 "RenderBlock.h"
     26 
     27 namespace WebCore {
     28 
     29 class VisibleSelection;
     30 class TextControlInnerElement;
     31 class TextControlInnerTextElement;
     32 
     33 class RenderTextControl : public RenderBlock {
     34 public:
     35     virtual ~RenderTextControl();
     36 
     37     HTMLElement* innerTextElement() const;
     38 
     39     bool lastChangeWasUserEdit() const { return m_lastChangeWasUserEdit; }
     40     void setLastChangeWasUserEdit(bool lastChangeWasUserEdit);
     41 
     42     int selectionStart() const;
     43     int selectionEnd() const;
     44     PassRefPtr<Range> selection(int start, int end) const;
     45 
     46     virtual void subtreeHasChanged();
     47     String text();
     48     String textWithHardLineBreaks();
     49     void selectionChanged(bool userTriggered);
     50 
     51     VisiblePosition visiblePositionForIndex(int index) const;
     52     static int indexForVisiblePosition(HTMLElement*, const VisiblePosition&);
     53 
     54     void updatePlaceholderVisibility(bool, bool);
     55 
     56 protected:
     57     RenderTextControl(Node*, bool);
     58 
     59     int scrollbarThickness() const;
     60     void adjustInnerTextStyle(const RenderStyle* startStyle, RenderStyle* textBlockStyle) const;
     61     void setInnerTextValue(const String&);
     62 
     63     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
     64 
     65     void createSubtreeIfNeeded(TextControlInnerElement* innerBlock);
     66     void hitInnerTextElement(HitTestResult&, int x, int y, int tx, int ty);
     67     void forwardEvent(Event*);
     68 
     69     int textBlockWidth() const;
     70     int textBlockHeight() const;
     71 
     72     float scaleEmToUnits(int x) const;
     73 
     74     static bool hasValidAvgCharWidth(AtomicString family);
     75     virtual float getAvgCharWidth(AtomicString family);
     76     virtual int preferredContentWidth(float charWidth) const = 0;
     77     virtual void adjustControlHeightBasedOnLineHeight(int lineHeight) = 0;
     78     virtual void cacheSelection(int start, int end) = 0;
     79     virtual PassRefPtr<RenderStyle> createInnerTextStyle(const RenderStyle* startStyle) const = 0;
     80     virtual RenderStyle* textBaseStyle() const = 0;
     81 
     82     virtual void updateFromElement();
     83     virtual void computeLogicalHeight();
     84 
     85     bool m_placeholderVisible;
     86 
     87 private:
     88     virtual const char* renderName() const { return "RenderTextControl"; }
     89     virtual bool isTextControl() const { return true; }
     90     virtual void computePreferredLogicalWidths();
     91     virtual void removeLeftoverAnonymousBlock(RenderBlock*) { }
     92     virtual bool canHaveChildren() const { return false; }
     93     virtual bool avoidsFloats() const { return true; }
     94     void setInnerTextStyle(PassRefPtr<RenderStyle>);
     95     virtual void paintObject(PaintInfo&, int tx, int ty);
     96 
     97     virtual void addFocusRingRects(Vector<IntRect>&, int tx, int ty);
     98 
     99     virtual bool canBeProgramaticallyScrolled(bool) const { return true; }
    100 
    101     virtual bool requiresForcedStyleRecalcPropagation() const { return true; }
    102 
    103     String finishText(Vector<UChar>&) const;
    104 
    105     bool hasVisibleTextArea() const;
    106     friend void setSelectionRange(Node*, int start, int end);
    107     static bool isSelectableElement(HTMLElement*, Node*);
    108 
    109     virtual int textBlockInsetLeft() const = 0;
    110     virtual int textBlockInsetRight() const = 0;
    111     virtual int textBlockInsetTop() const = 0;
    112 
    113     void paintPlaceholder(PaintInfo&, int tx, int ty);
    114 
    115     bool m_lastChangeWasUserEdit;
    116     RefPtr<TextControlInnerTextElement> m_innerText;
    117 };
    118 
    119 void setSelectionRange(Node*, int start, int end);
    120 
    121 inline RenderTextControl* toRenderTextControl(RenderObject* object)
    122 {
    123     ASSERT(!object || object->isTextControl());
    124     return static_cast<RenderTextControl*>(object);
    125 }
    126 
    127 inline const RenderTextControl* toRenderTextControl(const RenderObject* object)
    128 {
    129     ASSERT(!object || object->isTextControl());
    130     return static_cast<const RenderTextControl*>(object);
    131 }
    132 
    133 // This will catch anyone doing an unnecessary cast.
    134 void toRenderTextControl(const RenderTextControl*);
    135 
    136 } // namespace WebCore
    137 
    138 #endif // RenderTextControl_h
    139