rendertextcontrolsingleline.h

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#ifndef RenderTextControlSingleLine_h
#define RenderTextControlSingleLine_h

#include "PopupMenuClient.h"
#include "RenderTextControl.h"
#include "Timer.h"

namespace WebCore {

class InputElement;
class SearchFieldCancelButtonElement;
class SearchFieldResultsButtonElement;
class SearchPopupMenu;
class TextControlInnerElement;

class RenderTextControlSingleLine : public RenderTextControl, private PopupMenuClient {
public:
    RenderTextControlSingleLine(Node*);
    virtual ~RenderTextControlSingleLine();

    virtual bool hasControlClip() const { return m_cancelButton; }
    virtual bool isTextField() const { return true; }

    bool placeholderIsVisible() const { return m_placeholderVisible; }
    bool placeholderShouldBeVisible() const;
    void updatePlaceholderVisibility();

    void addSearchResult();
    void stopSearchEventTimer();

    bool popupIsVisible() const { return m_searchPopupIsVisible; }
    void showPopup();
    virtual void hidePopup(); // PopupMenuClient method

    virtual void subtreeHasChanged();
    virtual void paint(PaintInfo&, int tx, int ty);
    virtual void layout();

    virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty, HitTestAction);
    void forwardEvent(Event*);

    void capsLockStateMayHaveChanged();

private:
    int textBlockWidth() const;
    virtual int preferredContentWidth(float charWidth) const;
    virtual void adjustControlHeightBasedOnLineHeight(int lineHeight);

    void createSubtreeIfNeeded();
    virtual void updateFromElement();
    virtual void cacheSelection(int start, int end);
    virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);

    virtual PassRefPtr<RenderStyle> createInnerTextStyle(const RenderStyle* startStyle) const;
    PassRefPtr<RenderStyle> createInnerBlockStyle(const RenderStyle* startStyle) const;
    PassRefPtr<RenderStyle> createResultsButtonStyle(const RenderStyle* startStyle) const;
    PassRefPtr<RenderStyle> createCancelButtonStyle(const RenderStyle* startStyle) const;

    void updateCancelButtonVisibility(RenderStyle*) const;
    const AtomicString& autosaveName() const;

    void startSearchEventTimer();
    void searchEventTimerFired(Timer<RenderTextControlSingleLine>*);

private:
    // PopupMenuClient methods
    virtual void valueChanged(unsigned listIndex, bool fireEvents = true);
    virtual String itemText(unsigned listIndex) const;
    virtual bool itemIsEnabled(unsigned listIndex) const;
    virtual PopupMenuStyle itemStyle(unsigned listIndex) const;
    virtual PopupMenuStyle menuStyle() const;
    virtual int clientInsetLeft() const;
    virtual int clientInsetRight() const;
    virtual int clientPaddingLeft() const;
    virtual int clientPaddingRight() const;
    virtual int listSize() const;
    virtual int selectedIndex() const;
    virtual bool itemIsSeparator(unsigned listIndex) const;
    virtual bool itemIsLabel(unsigned listIndex) const;
    virtual bool itemIsSelected(unsigned listIndex) const;
    virtual bool shouldPopOver() const { return false; }
    virtual bool valueShouldChangeOnHotTrack() const { return false; }
    virtual void setTextFromItem(unsigned listIndex);
    virtual FontSelector* fontSelector() const;
    virtual HostWindow* hostWindow() const;
    virtual PassRefPtr<Scrollbar> createScrollbar(ScrollbarClient*, ScrollbarOrientation, ScrollbarControlSize);

    InputElement* inputElement() const;

private:
    bool m_placeholderVisible;
    bool m_searchPopupIsVisible;
    bool m_shouldDrawCapsLockIndicator;

    RefPtr<TextControlInnerElement> m_innerBlock;
    RefPtr<SearchFieldResultsButtonElement> m_resultsButton;
    RefPtr<SearchFieldCancelButtonElement> m_cancelButton;

    Timer<RenderTextControlSingleLine> m_searchEventTimer;
    RefPtr<SearchPopupMenu> m_searchPopup;
    Vector<String> m_recentSearches;
};

}

#endif