kwin/lib/kdecoration.h

/*****************************************************************
This file is part of the KDE project.

Copyright (C) 2003 Lubos Lunak <l.lunak@kde.org>

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
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Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
******************************************************************/

#ifndef KDECORATION_H
#define KDECORATION_H

#include <qcolor.h>
#include <qfont.h>
#include <qobject.h>
#include <qiconset.h>
#include <netwm_def.h>

class KDecorationOptionsPrivate;
class KDecorationBridge;
class KDecorationPrivate;
class KDecorationFactory;

/**
 * This class provides a namespace for all decoration related classes.
 * All shared types are defined here.
 */
class KDecorationDefines
{
public:
    enum MousePosition { // FRAME nejake lepsi pojmenovani
    	    Nowhere, TopLeft2 , BottomRight2, BottomLeft2, TopRight2, Top, Bottom, Left, Right, Center
	};
    /**
     * Maximize mode. These values specify how a window is maximized.
     */
    // these values are written to session files, don't change the order
    enum MaximizeMode {
	    MaximizeRestore    = 0, ///< The window is not maximized in any direction.
	    MaximizeVertical   = 1, ///< The window is maximized vertically.
	    MaximizeHorizontal = 2, ///< The window is maximized horizontally.
	    /// Equal to @p MaximizeVertical | @p MaximizeHorizontal
	    MaximizeFull = MaximizeVertical | MaximizeHorizontal 
    };

    enum WindowOperation{
        MaximizeOp = 5000,
        RestoreOp,
        MinimizeOp,
        MoveOp,
        UnrestrictedMoveOp,
        ResizeOp,
        UnrestrictedResizeOp,
        CloseOp,
        OnAllDesktopsOp,
        ShadeOp,
        KeepAboveOp,
        KeepBelowOp,
        OperationsOp,
        ToggleStoreSettingsOp,
        HMaximizeOp,
        VMaximizeOp,
        LowerOp,
        FullScreenOp,
        NoBorderOp,
        NoOp
    };
    /**
     * Basic color types that should be recognized by all decoration styles.
     * Decorations are not required to implement all the colors, but for the ones that
     * are implemented the color setting for them should be obeyed.
     */
    enum ColorType
	{
	ColorTitleBar,   ///< The color for the titlebar
	ColorTitleBlend, ///< The blend color for the titlebar
	ColorFont,       ///< The titlebar text color
	ColorButtonBg,   ///< The color to use for the titlebar buttons
	ColorFrame,      ///< The color for the window frame (border)
	ColorHandle,     ///< The color for the resize handle
	NUM_COLORS
	};
    
    /**
     * These flags specify which settings changed when rereading settings.
     * Each setting in class KDecorationOptions specifies its matching flag.
     */
    enum
        {
        SettingDecoration = 1 << 0, ///< The decoration was changed
        SettingColors     = 1 << 1, ///< The color palette was changed
        SettingFont       = 1 << 2, ///< The titlebar font was changed
        SettingButtons    = 1 << 3, ///< The button layout was changed
        SettingTooltips   = 1 << 4, ///< The tooltip setting was changed
        SettingBorder     = 1 << 5  ///< The border size setting was changed
        };
        
    /**
     * Border size. KDecorationOptions::preferredBorderSize() returns
     * one of these values.
     */
    enum BorderSize
        {
        BorderTiny,      ///< Minimal borders
        BorderNormal,    ///< Standard size borders, the default setting
        BorderLarge,     ///< Larger borders
        BorderVeryLarge, ///< Very large borders
        BorderHuge       ///< Huge borders
        };
};    

/**
 * This class holds various configuration settings for the decoration.
 * It is accessible from the decorations either as KDecoration::options()
 * or KDecorationFactory::options().
 */
class KDecorationOptions : public KDecorationDefines
    {
public:
    KDecorationOptions();
    virtual ~KDecorationOptions();
    /**
     * Returns the color that should be used for the given part of the decoration.
     * The changed flags for this setting is SettingColors.
     *
     * @param type   The requested color type.
     * @param active Whether the color should be for active or inactive windows.
     */
    const QColor& color(ColorType type, bool active=true) const;
    /**
     * Returns a colorgroup using the given decoration color as the background.
     * The changed flags for this setting is SettingColors.
     *
     * @param type   The requested color type.
     * @param active Whether to return the color for active or inactive windows.
     */
    const QColorGroup& colorGroup(ColorType type, bool active=true) const;
    /**
     * Returns the active or inactive decoration font.
     * The changed flags for this setting is SettingFont.
     *
     * @param active Whether to return the color for active or inactive windows.
     * @param small  If @a true, returns a font that's suitable for tool windows.
     */
    const QFont& font(bool active=true, bool small = false) const;
    /**
    * @Returns @a true if the style should use custom button positions
    * The changed flags for this setting is SettingButtons.
    *
    * @see titleButtonsLeft
    * @see titleButtonsRight
    */
    bool customButtonPositions() const;
    /**
    * If customButtonPositions() returns true, titleButtonsLeft
    * returns which buttons should be on the left side of the titlebar from left
    * to right. Characters in the returned string have this meaning :
    * @li 'M' menu button
    * @li 'S' on_all_desktops button
    * @li 'H' quickhelp button
    * @li 'I' minimize ( iconify ) button
    * @li 'A' maximize button
    * @li 'X' close button
    * @li '_' spacer
    *
    * The default ( which is also returned if customButtonPositions returns false )
    * is "MS".
    * The changed flags for this setting is SettingButtons.
    */
    // FRAME vice druhu tlacitek
    QString titleButtonsLeft() const;
    /**
    * If customButtonPositions() returns true, titleButtonsRight
    * returns which buttons should be on the right side of the titlebar from left
    * to right. Characters in the return string have the same meaning like
    * in titleButtonsLeft().
    *
    * The default ( which is also returned if customButtonPositions returns false )
    * is "HIAX".
    * The changed flags for this setting is SettingButtons.
    */
    QString titleButtonsRight() const;

    /**
    * @returns true if the style should use tooltips for window buttons
    * The changed flags for this setting is SettingTooltips.
    */
    bool showTooltips() const;
    
    /**
     * The preferred border size selected by the user, e.g. for accessibility
     * reasons, or when using high resolution displays. It's up to the decoration
     * to decide which borders or if any borders at all will obey this setting.
     * The changed flags for this setting is SettingBorder.
     */
    BorderSize preferredBorderSize() const;

    /*
     * When this functions returns false, moving and resizing of maximized windows
     * is not allowed, and therefore the decoration is allowed to turn off (some of)
     * its borders.
     * The changed flags for this setting is SettingButtons.
     */
    bool moveResizeMaximizedWindows() const;

    /**
     * @internal
     */
    virtual unsigned long updateSettings() = 0; // returns SettingXYZ mask

protected:
    /**
     * @internal
     */
    KDecorationOptionsPrivate* d;
    };


/**
 * This is the base class for a decoration object. It provides functions
 * that give various information about the decorated window, and also
 * provides pure virtual functions for controlling the decoration that
 * every decoration should implement.
 */
class KDecoration
    : public QObject, public KDecorationDefines
    {
    Q_OBJECT
    public:
	/**
	 * Constructs a KDecoration object. Both the arguments are passed from
	 * KDecorationFactory. Note that the initialization code of the decoration
	 * should be done in the init() method.
	 */
	KDecoration( KDecorationBridge* bridge, KDecorationFactory* factory );
	/**
	 * Destroys the KDecoration.
	 */
	virtual ~KDecoration();
	
	// requests from decoration
	
	/**
	 * Returns the KDecorationOptions object, which is used to access
	 * configuration settings for the decoration.
	 */
        static const KDecorationOptions* options();
	/**
	 * Returns @a true if the decorated window is currently active.
	 */
	bool isActive() const;
	/**
	 * Returns @a true if the decoration window can be closed by the user.
	 */
	bool isCloseable() const;
	/**
	 * Returns @a true if the decorated window can be maximized.
	 */
	bool isMaximizable() const;
	/**
	 * Returns the current maximization mode of the decorated window.
	 * Note that only fully maximized windows should be treated
	 * as "maximized" (e.g. if the maximize button has only two states).
	 */
	MaximizeMode maximizeMode() const;
	/**
	 * Returns @a true if the decorated window can be minimized by the user.
	 */
	bool isMinimizable() const;
	/**
	 * Return @a true if the decorated window can show context help
	 * (i.e. the decoration should provide the context help button).
	 */
        bool providesContextHelp() const;
	/**
	 * Returns the number of the virtual desktop the decorated window
	 * is currently on (including NET::OnAllDesktops for being on all
	 * desktops).
	 */
        int desktop() const;
	/**
	 * Convenience function that returns @a true if the window is on all
	 * virtual desktops.
	 */
        bool isOnAllDesktops() const; // convenience
	/**
	 * Returns @a true if the decoration window is modal (usually a modal dialog).
	 */
        bool isModal() const;
	/**
	 * Returns @a true if the decorated window can be shaded.
	 */
        bool isShadeable() const;
	/**
	 * Returns @a true if the decorated window is currently shaded.
	 */
        bool isShade() const;
	/**
	 * Returns @a true if the decorated window should be kept above other windows.
	 */
        bool keepAbove() const;
	/**
	 * Returns @a true if the decorated window should be kept below other windows.
	 */
        bool keepBelow() const;
	/**
	 * Returns @a true if the decorated window can be moved by the user.
	 */
        bool isMovable() const;
	/**
	 * Returns @a true if the decorated window can be resized by the user.
	 */
        bool isResizable() const;
	/**
	 * This function returns the window type of the decorated window.
	 * The argument to this function is a mask of all window types
	 * the decoration knows about (as the list of valid window types
	 * is extended over time, and fallback types are specified in order
	 * to support older code). For a description of all window types,
	 * see the definition of the NET::WindowType type. Note that
	 * some window types never have decorated windows.
	 * 
	 * An example of usage:
	 * @code
	 * const unsigned long supported_types = NET::NormalMask | NET::DesktopMask
	 * 	| NET::DockMask | NET::ToolbarMask | NET::MenuMask | NET::DialogMask
	 * 	| NET::OverrideMask | NET::TopMenuMask | NET::UtilityMask | NET::SplashMask;
	 *
	 * NET::WindowType type = windowType( supported_types );
	 *
	 * if( type == NET::Utility || type == NET::Menu || type == NET::Toolbar )
	 *    // ... use smaller decorations for tool window types
	 * else
	 *    // ... use normal decorations
	 * @endcode
	 */
        NET::WindowType windowType( unsigned long supported_types ) const;
	/**
	 * Returns an icon set with the decorated window's icon.
	 */
	QIconSet icon() const;
	/**
	 * Returns the decorated window's caption that should be shown in the titlebar.
	 */
	QString caption() const;
	/**
	 * This function invokes the window operations menu.
	 */
	void showWindowMenu( QPoint pos );
	void performWindowOperation( WindowOperation op );
	/**
	 * If the decoration is non-rectangular, this function needs to be called
	 * to set the shape of the decoration.
	 *
	 * @param reg  The shape of the decoration.
	 * @param mode The X11 values Unsorted, YSorted, YXSorted and YXBanded that specify
	 *             the sorting of the rectangles, default value is Unsorted.
	 */
        void setMask( const QRegion& reg, int mode = 0 );
	/**
	 * This convenience function resets the shape mask.
	 */
        void clearMask(); // convenience
	/**
	 * If this function returns @a true, the decorated window is used as a preview
	 * e.g. in the configuration module. In such case, the decoration can e.g.
	 * show some information in the window area.
	 */
        bool isPreview() const;
	/**
	 * Returns the geometry of the decoration.
	 */
        QRect geometry() const;
	/**
	 * Returns the icon geometry for the window, i.e. the geometry of the taskbar
	 * entry. This is used mainly for window minimize animations. Note that
	 * the geometry may be null.
	 */
        QRect iconGeometry() const;
	/**
	 * Returns the main workspace widget. The main purpose of this function is to
	 * allow painting the minimize animation or the transparent move bound on it.
	 */
        QWidget* workspaceWidget() const;
	/**
	 * Convenience function that returns the width of the decoration.
	 */
        int width() const; // convenience
	/**
	 * Convenience function that returns the height of the decoration.
	 */
        int height() const;  // convenience
	/**
	 * This function is the default handler for mouse events. All mouse events
	 * that are not handled by the decoration itself should be passed to it
	 * in order to make work operations like window resizing by dragging borders etc.
	 */
	void processMousePressEvent( QMouseEvent* e );

	// requests to decoration

	/**
	 * This function is called immediately after the decoration object is created.
	 * Due to some technical reasons, initialization should be done here
	 * instead of in the constructor.
	 */
        virtual void init() = 0; // called once right after created
	
	virtual MousePosition mousePosition( const QPoint& p ) const = 0;
	/**
	 * This function should return the distance from each window side to the inner
	 * window. The sizes may depend on the state of the decorated window, such as
	 * whether it's shaded. Decorations often turn off their bottom border when the
	 * window is shaded, and turn off their left/right/bottom borders when
	 * the window is maximized and moving and resizing of maximized windows is disabled.
	 * This function mustn't do any repaints or resizes. Also, if the sizes returned
	 * by this function don't match the real values, this may result in drawing errors
	 * or other problems.
	 *
	 * @see KDecorationOptions::moveResizeMaximizedWindows()
	 */
        // mustn't do any repaints, resizes or anything like that
	virtual void borders( int& left, int& right, int& top, int& bottom ) const = 0;
	/**
	 * This method is called by kwin when the style should resize the decoration window.
	 * The usual implementation is to resize the main widget of the decoration to the
	 * given size.
	 *
	 * @param s Specifies the new size of the decoration window.
	 */
	virtual void resize( const QSize& s ) = 0;
	/**
	 * This function should return the minimum required size for the decoration.
	 * Note that the returned size shouldn't be too large, because it will be
	 * used to keep the decorated window at least as large.
	 */
	virtual QSize minimumSize() const = 0;
	/**
	 * This function is called whenever the window either becomes or stops being active.
	 * Use isActive() to find out the current state.
	 */
        virtual void activeChange() = 0;
	/**
	 * This function is called whenever the caption changes. Use caption() to get it.
	 */
        virtual void captionChange() = 0;
	/**
	 * This function is called whenever the window icon changes. Use icon() to get it.
	 */
        virtual void iconChange() = 0;
	/**
	 * This function is called whenever the maximalization state of the window changes.
	 * Use maximizeMode() to get the current state.
	 */
        virtual void maximizeChange() = 0;
	/**
	 * This function is called whenever the desktop for the window changes. Use
	 * desktop() or isOnAllDesktops() to find out the current desktop
	 * on which the window is.
	 */
        virtual void desktopChange() = 0;
	/**
	 * This function is called whenever the window is shaded or unshaded. Use
	 * isShade() to get the current state.
	 */
        virtual void shadeChange() = 0;
	/**
	 * This function may be reimplemented to provide custom bound drawing
	 * for transparent moving or resizing of the window.
	 * @a False should be returned if the default implementation should be used.
	 *
	 * @param geom  The geometry at this the bound should be drawn
	 * @param clear @a true if the bound should be cleared
	 *
	 * @see workspaceWidget() and geometry().
	 */
        virtual bool drawbound( const QRect& geom, bool clear );
	/**
	 * This function may be reimplemented to provide custom minimize/restore animations
	 * The reimplementation is allowed to perform X server grabs if necessary, but no
	 * futher event processing is allowed (i.e. no kapp->processEvents()).
	 * @a False should be returned if the default implementation should be used.
	 * Note that you should not use this function to force disabling of the animation.
	 *
	 * @see workspaceWidget(), geometry() and helperShowHide().
	 */
        virtual bool animateMinimize( bool minimize );
	/**
	 * This function is called to reset the decoration on settings changes.
	 * It is usually invoked by calling KDecorationFactory::resetDecorations().
	 * 
	 * @param changed Specifies which settings were changed, given by the SettingXXX masks
	 */
        virtual void reset( unsigned long changed );

	// special

	/**
	 * This should be the first function called in init() to specify
	 * the main widget of the decoration. The widget should be created
	 * with parent specified by initialParentWidget() and flags
	 * specified by initialWFlags().
	 */	
        void setMainWidget( QWidget* );
	/**
	 * Convenience functions that creates and sets a main widget as necessary.
	 * In such case, it's usually needed to install an event filter
	 * on the main widget to receive important events on it.
	 *
	 * @param flags Additional widget flags for the main widget. Note that only
	 *              flags that affect widget drawing are allowed. Window type flags
	 *              like WX11BypassWM or WStyle_NoBorder are forbidden.
	 */
        void createMainWidget( WFlags flags = 0 );
	/**
	 * The parent widget that should be used for the main widget.
	 */
        QWidget* initialParentWidget() const;
	/**
	 * The flags that should be used when creating the main widget.
	 * It is possible to add more flags when creating the main widget, but only flags
	 * that affect widget drawing are allowed. Window type flags like WX11BypassWM
	 * or WStyle_NoBorder are forbidden.
	 */
        WFlags initialWFlags() const;
	/**
	 * This function is only allowed to be called once from animateMinimize().
	 * It can be used if the window should be shown or hidden at a specific
	 * time during the animation. It is forbidden to use this function
	 * for other purposes.
	 */
        void helperShowHide( bool show );
	/**
	 * Returns the main widget for the decoration.
	 */
	QWidget* widget();
	/**
	 * Returns the main widget for the decoration.
	 */
	const QWidget* widget() const;
	/**
	 * Returns the factory that created this decoration.
	 */
        KDecorationFactory* factory() const;
    public slots:
	// requests from decoration

	/**
	 * This function can be called by the decoration to request 
	 * closing of the decorated window. Note that closing the window
	 * also involves destroying the decoration.
	 */
	void closeWindow();
	/**
	 * Set the maximize mode of the decorated window.
	 * @param mode The maximization mode to be set.
	 */
	void maximize( MaximizeMode mode );
	/**
	 * Minimize the decorated window.
	 */
	void minimize();
	/**
	 * Start showing context help in the window (i.e. the mouse will enter
	 * the what's this mode).
	 */
        void showContextHelp();
        void setDesktop( int desktop );
	/**
	 * This function toggles the on-all-desktops state of the decorated window.
	 */
        void toggleOnAllDesktops(); // convenience
	/**
	 * This function performs the operation configured as titlebar double click
	 * operation.
	 */
        void titlebarDblClickOperation();
	/**
	 * Shades or unshades the decorated window.
	 * @param set Whether the window should be shaded
	 */
        void setShade( bool set );
	/**
	 * Sets or reset keeping this window above others.
	 * @param set Whether to keep the window above others
	 */
        void setKeepAbove( bool set );
	/**
	 * Sets or reset keeping this window below others.
	 * @param set Whether to keep the window below others
	 */
        void setKeepBelow( bool set );
    private:
	KDecorationBridge* bridge_;
	QWidget* w_;
        KDecorationFactory* factory_;
        friend class KDecorationOptions; // for options_
        static KDecorationOptions* options_;
        KDecorationPrivate* d;
    };

inline
KDecorationDefines::MaximizeMode operator^( KDecorationDefines::MaximizeMode m1, KDecorationDefines::MaximizeMode m2 )
    {
    return KDecorationDefines::MaximizeMode( int(m1) ^ int(m2) );
    }

inline
KDecorationDefines::MaximizeMode operator&( KDecorationDefines::MaximizeMode m1, KDecorationDefines::MaximizeMode m2 )
    {
    return KDecorationDefines::MaximizeMode( int(m1) & int(m2) );
    }

inline
KDecorationDefines::MaximizeMode operator|( KDecorationDefines::MaximizeMode m1, KDecorationDefines::MaximizeMode m2 )
    {
    return KDecorationDefines::MaximizeMode( int(m1) | int(m2) );
    }

inline QWidget* KDecoration::widget()
    {
    return w_;
    }

inline const QWidget* KDecoration::widget() const
    {
    return w_;
    }

inline KDecorationFactory* KDecoration::factory() const
    {
    return factory_;
    }

inline bool KDecoration::isOnAllDesktops() const
    {
    return desktop() == NET::OnAllDesktops;
    }

inline int KDecoration::width() const
    {
    return geometry().width();
    }
    
inline int KDecoration::height() const
    {
    return geometry().height();
    }
    
#endif