/* This file is part of the KDE libraries
Copyright (C) 1998 Kurt Granroth
Copyright (C) 2000 Peter Putzer
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License version 2 as published by the Free Software Foundation.
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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#ifndef KURLLABEL_H
#define KURLLABEL_H
#include
class QColor;
class QCursor;
class QPixmap;
/**
* A label class that supports displaying an active hyperlink.
*
* KURLLabel is a drop-in replacement for QLabel that handles text
* in a fashion similar to how an HTML widget handles hyperlinks. The
* text can be underlined (or not) and set to different colors. It
* can also "glow" (cycle colors) when the mouse passes over it.
*
* KURLLabel also provides signals for several events, including
* the mouse leaving and entering the text area and all forms of
* mouse clicking.
*
* A typical usage would be something like so:
*
*
* KURLLabel *address = new KURLLabel(this);
* address->setText("My homepage");
* address->setURL("http://www.home.com/~me");
* connect(address, SIGNAL(leftClickedURL(const QString&)),
* SLOT(processMyURL(const QString&)));
*
*
* In this example, the text "My homepage" would be displayed
* as blue, underlined text. When the mouse passed over it,
* it would "glow" red. When the user clicks on the text, the
* signal @ref leftClickedURL() would be emitted with "http://www.home.com/~me"
* as its argument.
*
* @short A drop-in replacement for QLabel that displays hyperlinks.
* @author Kurt Granroth (Interface)
* @author Peter Putzer (Rewrite)
* @version $Id: kurllabel_h.html 132191 2002-01-17 21:32:13Z dfaure $
*
*/
class KURLLabel : public QLabel
{
Q_OBJECT
Q_PROPERTY (QString url READ url WRITE setURL)
Q_PROPERTY (QPixmap altPixmap READ altPixmap WRITE setAltPixmap)
public:
/**
* Default constructor.
*
* Use @ref #setURL() and @ref #setText() or @ref QListView::setPixmap()
* to set the resp. properties.
*/
KURLLabel (QWidget* parent = 0L, const char* name = 0L);
/**
* Convenience constructor.
*
* @param url is the URL emitted when the label is clicked.
* @param text is the displayed string. If it's equal to QString::null
* the @p url will be used instead.
*
* @p parent and @p name are passed to @ref QLabel.
*/
KURLLabel (const QString& url, const QString& text = QString::null,
QWidget* parent = 0L, const char* name = 0L);
/**
* Destructor.
*/
virtual ~KURLLabel ();
/**
* Retreive the URL.
*
* @return the URL.
*/
const QString& url () const;
/**
* Retreive the tooltip text.
*
* @return the current tooltip text.
*/
const QString& tipText () const;
/**
* @return true if a tooltip will be displayed.
*
* @see setTipText()
*/
bool useTips () const;
/**
* @return true if the cursor will change while over the URL.
*
* @see setUseCursor ()
*/
bool useCursor () const;
/**
* When this is on, the text will switch to the selected
* color whenever the mouse passes over it.
*/
bool isGlowEnabled () const;
/**
* This feature is very similar to the "glow" feature in that the color of the
* label switches to the selected color when the cursor passes
* over it. In addition, underlining is turned on for as
* long as the mouse is overhead. Note that if "glow" and
* underlining are both already turned on, this feature
* will have no visible effect.
*/
bool isFloatEnabled () const;
/**
* @return the alternate pixmap (may be 0L if none was set).
*/
const QPixmap* altPixmap () const;
public slots:
/**
* Turn on or off the underlining.
*
* When this is on, the
* text will be underlined. By default, it is @p true.
*/
void setUnderline (bool on = true);
/**
* Sets the URL for this label to @p url.
*
* @see #url
*/
void setURL (const QString& url);
/**
* Overridden for internal reasons; the API remains unaffected.
*/
virtual void setFont (const QFont&);
/**
* Turn on or off the tool tip feature.
*
* When this is on, the URL will be displayed as a
* tooltip whenever the mouse passes passes over it.
* By default, it is @p false.
*/
void setUseTips (bool on = true);
/**
* Specifies what text to display when tooltips are turned on.
*
* If this is not used, the tip will default to the URL.
*
* @see setUseTips()
*/
void setTipText (const QString& tip);
/**
* Set the highlight color.
*
* This is the default foreground
* color (non-selected). By default, it is @p blue.
*/
void setHighlightedColor(const QColor& highcolor);
/**
* This is an overloaded version for convenience.
*
* @see setHighlightedColor()
*/
void setHighlightedColor(const QString& highcolor);
/**
* Set the selected color.
*
* This is the color the text will change
* to when either a mouse passes over it and "glow" mode is on or
* when it is selected (clicked). By default, it is @p red.
*/
void setSelectedColor(const QColor& selcolor);
/**
* This is an overloaded version for convenience.
*
* @see setSelectedColor()
*/
void setSelectedColor(const QString& selcolor);
/**
* Turn the custom cursor feature on or off.
*
* When this is on, the cursor will change to a custom cursor
* (default is a "pointing hand") whenever the cursor passes
* over the label. By default, it is on.
*
* @param on whether a custom cursor should be displayed.
* @param cursor is the custom cursor. @p 0L indicates the default "hand cursor".
*/
void setUseCursor (bool on, QCursor* cursor = 0L);
/**
* Turn on or off the "glow" feature.
*
* When this is on, the text will switch to the
* selected color whenever the mouse
* passes over it. By default, it is @p true.
*/
void setGlow (bool glow = true);
/**
* Turn on or off the "float" feature.
*
* This feature is very similar to the "glow" feature in
* that the color of the label switches to the selected
* color when the cursor passes over it. In addition,
* underlining is turned on for as long as the mouse is overhead.
* Note that if "glow" and underlining are both already turned
* on, this feature will have no visible effect.
* By default, it is @p false.
*/
void setFloat (bool do_float = true);
/**
* Set the "alt" pixmap.
*
* This pixmap will be displayed when the
* cursor passes over the label. The effect is similar to the
* trick done with 'onMouseOver' in javascript.
*
* @see altPixmap()
*/
void setAltPixmap (const QPixmap& altPix);
signals:
/**
* The mouse has passed over the label.
*
* @param url The URL for this label.
*/
void enteredURL (const QString& url);
/**
* The mouse has passed over the label.
*/
void enteredURL ();
/**
* The mouse is no longer over the label.
*
* @param url The URL for this label.
*/
void leftURL (const QString& url);
/**
* The mouse is no longer over the label.
*/
void leftURL ();
/**
* The user clicked the left mouse button on this label.
*
* @param url The URL for this label.
*/
void leftClickedURL(const QString& url);
/**
* The user clicked the left mouse button on this label.
*/
void leftClickedURL();
/**
* The user clicked the right mouse button on this label.
*
* @param url The URL for this label.
*/
void rightClickedURL(const QString& url);
/**
* The user clicked the left mouse button on this label.
*/
void rightClickedURL();
/**
* The user clicked the middle mouse button on this label.
*
* @param url The URL for this label.
*/
void middleClickedURL(const QString& url);
/**
* The user clicked the left mouse button on this label.
*/
void middleClickedURL();
protected:
/**
* Overridden for internal reasons; the API remains unaffected.
*/
virtual void mousePressEvent (QMouseEvent*);
/**
* Overridden for internal reasons; the API remains unaffected.
*/
virtual void mouseReleaseEvent (QMouseEvent*);
/**
* Overridden for internal reasons; the API remains unaffected.
*/
virtual void enterEvent (QEvent*);
/**
* Overridden for internal reasons; the API remains unaffected.
*/
virtual void leaveEvent (QEvent*);
private slots:
/**
* @internal
* Slot used to reset the link-color to normal (timer-driven).
*/
void updateColor ();
private:
class Private;
Private* d;
/**
* @internal
* A private helper function to set the link-color to @p col.
*/
void setLinkColor (const QColor& col);
};
#endif // KURLLABEL_H
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