Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdegraphics@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 535 insertions, 0 deletions

diff --git a/kolourpaint/kpview.h b/kolourpaint/kpview.h
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+
+/*
+   Copyright (c) 2003,2004,2005 Clarence Dang <[email protected]>
+   All rights reserved.
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+
+   1. Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+   2. Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+   THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+   IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+   INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+   NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+   THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#ifndef KP_VIEW_H
+#define KP_VIEW_H
+
+
+#include <qwidget.h>
+
+#include <kpdefs.h>
+
+
+class kpDocument;
+class kpSelection;
+class kpTool;
+class kpToolToolBar;
+class kpViewManager;
+class kpViewScrollableContainer;
+
+
+/**
+ * @short Abstract base class for all views.
+ *
+ * This is the abstract base class for all views.  A view is a widget that
+ * renders a possibly zoomed onscreen representation of a document.
+ *
+ * 1 view corresponds to 1 document.
+ * 1 document corresponds to 0 or more views.
+ *
+ * @see kpViewManager
+ *
+ * @author Clarence Dang <[email protected]>
+ */
+class kpView : public QWidget
+{
+Q_OBJECT
+
+public:
+    /**
+     * Constructs a view.
+     *
+     * @param document The document this view is representing.
+     * @param toolToolBar The tool tool bar.
+     * @param viewManager The view manager.
+     * @param buddyView The view this view watches over (e.g. a thumbnail
+     *                  view would watch over the main view).  May be 0.
+     *                  See for example, highlightBuddyViewRectangle().
+     * @param scrollableContainer This view's scrollable container.
+     *                            May be 0.
+     *
+     * You must call adjustEnvironment() at the end of your constructor.
+     */
+    kpView (kpDocument *document,
+            kpToolToolBar *toolToolBar,
+            kpViewManager *viewManager,
+            kpView *buddyView,
+            kpViewScrollableContainer *scrollableContainer,
+            QWidget *parent, const char *name);
+
+    /**
+     * Destructs this view.  Informs the viewManager() that the mouse
+     * cursor is no longer above this view.
+     */
+    virtual ~kpView ();
+
+
+    /**
+     * @returns the document.
+     */
+    kpDocument *document () const;
+
+protected:
+    /**
+     * @returns the document's selection.
+     */
+    kpSelection *selection () const;
+
+public:
+    /**
+     * @returns the tool tool bar.
+     */
+    kpToolToolBar *toolToolBar () const;
+
+protected:
+    /**
+     * @returns the currently selected tool.
+     */
+    kpTool *tool () const;
+
+public:
+    /**
+     * @returns the view manager.
+     */
+    kpViewManager *viewManager () const;
+
+    /**
+     * @returns the buddy view.
+     */
+    kpView *buddyView () const;
+
+    /**
+     * @returns the buddyView()'s scrollable container.
+     */
+    kpViewScrollableContainer *buddyViewScrollableContainer () const;
+
+    /**
+     * @returns this view's scrollable container.
+     */
+    kpViewScrollableContainer *scrollableContainer () const;
+
+
+    /**
+     * @returns the horizontal zoom level (100 is unzoomed).
+     */
+    int zoomLevelX (void) const;
+
+    /**
+     * @returns the vertical zoom level (100 is unzoomed).
+     */
+    int zoomLevelY (void) const;
+
+    /**
+     * Sets the horizontal and vertical zoom levels.
+     *
+     * @param hzoom Horizontal zoom level.
+     * @param vzoom Vertical zoom level.
+     *
+     * If reimplementing, you must call this base implementation.
+     */
+    virtual void setZoomLevel (int hzoom, int vzoom);
+
+
+    /**
+     * @returns in views coordinates, where the top-left document() pixel
+     *          will be rendered (default: (0,0)).
+     */
+    QPoint origin () const;
+
+    /**
+     * Sets the origin.
+     *
+     * @param origin New origin.
+     *
+     * If reimplementing, you must call this base implementation.
+     */
+    virtual void setOrigin (const QPoint &origin);
+
+
+    /**
+     * @returns whether at this zoom level, the grid can be enabled.
+     *          This is based on whether the grid can be sensibly rendered.
+     */
+    bool canShowGrid () const;
+
+    /**
+     * @returns whether the grid is currently shown.
+     */
+    bool isGridShown () const;
+
+    /**
+     * Turns on/off the grid.
+     *
+     * @param yes Whether to enable the grid.
+     */
+    void showGrid (bool yes = true);
+
+
+    /**
+     * @returns whether to draw a rectangle highlighting the area of
+     *          buddyView() visible through buddyViewScrollableContainer().
+     */
+    bool isBuddyViewScrollableContainerRectangleShown () const;
+
+    /**
+     * Turns on/off the rectangle highlighting the area of buddyView()
+     * visible through buddyViewScrollableContainer() and redraws.
+     *
+     * @param yes Whether to turn on the rectangle.
+     */
+    void showBuddyViewScrollableContainerRectangle (bool yes = true);
+
+protected:
+    /**
+     * @returns the current rectangle highlighting the area of buddyView()
+     *          visible through buddyViewScrollableContainer(), that is being
+     *          rendered by this view.
+     */
+    QRect buddyViewScrollableContainerRectangle () const;
+
+protected slots:
+    /**
+     * Updates the buddyViewScrollableContainerRectangle() and redraws
+     * appropriately.
+     *
+     * This is already connected to zoomLevelChanged() and originChanged();
+     * buddyView() and buddyViewScrollableContainer() signals.  There is probably no
+     * need to call this function directly.
+     */
+    void updateBuddyViewScrollableContainerRectangle ();
+
+
+public:
+
+    /**
+     * @param viewX Horizontal position in view coordinates.
+     *
+     * @returns viewX transformed to document coordinates, based on the
+     *                origin() and zoomLevelX().
+     */
+    double transformViewToDocX (double viewX) const;
+
+    /**
+     * @param viewY Vertical position in view coordinates.
+     *
+     * @returns viewY transformed to document coordinates, based on the
+     *                origin() and zoomLevelY().
+     */
+    double transformViewToDocY (double viewY) const;
+
+    /**
+     * @param viewPoint Position in view coordinates.
+     *
+     * @returns viewPoint transformed to document coordinates, based on the
+     *                    origin(), zoomLevelX() and zoomLevelY().
+     */
+    QPoint transformViewToDoc (const QPoint &viewPoint) const;
+
+    /**
+     * @param viewRect Rectangle in view coordinates.
+     *
+     * @returns viewRect transformed to document coordinates based on the
+     *                   origin(), zoomLevelX() and zoomLevelY().
+     *
+     * For bounding rectangles, you should use this function instead of
+     * transformViewToDocX(), transformViewToDocY() or
+     * transformViewToDoc(const QPoint &) which act on coordinates only.
+     */
+    QRect transformViewToDoc (const QRect &viewRect) const;
+
+
+    /**
+     * @param docX Horizontal position in document coordinates.
+     *
+     * @returns docX transformed to view coordinates, based on the origin()
+     *               and zoomLevelX().
+     */
+    double transformDocToViewX (double docX) const;
+
+    /**
+     * @param docY Vertical position in document coordinates.
+     *
+     * @returns docY transformed to view coordinates, based on the origin()
+     *               and zoomLevelY().
+     */
+    double transformDocToViewY (double docY) const;
+
+    /**
+     * @param docPoint Position in document coordinates.
+     *
+     * @returns docPoint transformed to view coordinates, based on the
+     *                   origin(), zoomLevelX(), zoomLevelY().
+     */
+    QPoint transformDocToView (const QPoint &docPoint) const;
+
+    /**
+     * @param docRect Rectangle in document coordinates.
+     *
+     * @return docRect transformed to view coordinates, based on the
+     *                 origin(), zoomLevelX() and zoomLevelY().
+     *
+     * For bounding rectangles, you should use this function instead of
+     * transformDocToViewX(), transformDocToViewY() or
+     * transformDocToView(const QPoint &) which act on coordinates only.
+     */
+    QRect transformDocToView (const QRect &docRect) const;
+
+
+    /**
+     * @param viewPoint Position in view coordinates.
+     * @param otherView View whose coordinate system the return value will
+     *                  be in.
+     *
+     * @returns viewPoint transformed to the coordinate system of
+     *          @param otherView based on this and otherView's origin(),
+     *          zoomLevelX() and zoomLevelY().  This has less rounding
+     *          error than otherView->transformDocToView (transformViewToDoc (viewPoint)).
+     */
+    QPoint transformViewToOtherView (const QPoint &viewPoint,
+                                     const kpView *otherView);
+    
+                                        
+    /**
+     * @returns the approximate view width required to display the entire
+     *          document(), based on the zoom level only.
+     */
+    int zoomedDocWidth () const;
+
+    /**
+     * @returns the approximate view height required to display the entire
+     *          document(), based on the zoom level only.
+     */
+    int zoomedDocHeight () const;
+
+
+protected:
+    /**
+     * Updates the viewManager() on whether or not the mouse is directly
+     * above this view.  Among other things, this ensures the brush cursor
+     * is updated.
+     *
+     * This should be called in event handlers.
+     *
+     * @param yes Whether the mouse is directly above this view.
+     */
+    void setHasMouse (bool yes = true);
+
+
+public:
+    /**
+     * Adds a region (in view coordinates) to the dirty area that is
+     * repainted when the parent @ref kpViewManager is set not to queue
+     * updates.
+     *
+     * @param region Region (in view coordinates) that needs repainting.
+     */
+    void addToQueuedArea (const QRegion &region);
+
+    /**
+     * Convenience function.  Same as above.
+     *
+     * Adds a rectangle (in view coordinates) to the dirty area that is
+     * repainted when the parent @ref kpViewManager is set not to queue
+     * updates.
+     *
+     * @param rect Rectangle (in view coordinates) that needs repainting.
+     */
+     void addToQueuedArea (const QRect &rect);
+
+    /**
+     * Removes the dirty region that has been queued for updating.
+     * Does not update the view.
+     */
+    void invalidateQueuedArea ();
+
+    /**
+     * Updates the part of the view described by dirty region and then
+     * calls invalidateQueuedArea().  Does nothing if @ref kpViewManager
+     * is set to queue updates.
+     */
+    void updateQueuedArea ();
+    
+    void updateMicroFocusHint (const QRect &microFocusHint);
+
+
+public slots:
+    /**
+     * Call this when the "environment" (e.g. document size) changes.  The
+     * environment is defined by the caller and should be based on the type
+     * of view.  For instance, an unzoomed thumbnail view would also
+     * include in its environment the contents position of an associated
+     * scrollable container.
+     *
+     * This is never called by the kpView base class.
+     *
+     * Implementors should change whatever state is neccessary for their
+     * type of view.  For instance, an unzoomed view would resize itself;
+     * a zoomed thumbnail would change the zoom level.
+     */
+    virtual void adjustToEnvironment () = 0;
+
+
+public:
+    QRect selectionViewRect () const;
+
+    // (if <viewPoint> is KP_INVALID_POINT, it uses QCursor::pos())
+
+    QPoint mouseViewPoint (const QPoint &returnViewPoint = KP_INVALID_POINT) const;
+    QPoint mouseViewPointRelativeToSelection (const QPoint &viewPoint = KP_INVALID_POINT) const;
+    bool mouseOnSelection (const QPoint &viewPoint = KP_INVALID_POINT) const;
+
+    int textSelectionMoveBorderAtomicSize () const;
+    bool mouseOnSelectionToMove (const QPoint &viewPoint = KP_INVALID_POINT) const;
+
+protected:
+    bool selectionLargeEnoughToHaveResizeHandlesIfAtomicSize (int atomicSize) const;
+public:
+    int selectionResizeHandleAtomicSize () const;
+    bool selectionLargeEnoughToHaveResizeHandles () const;
+
+    QRegion selectionResizeHandlesViewRegion (bool forRenderer = false) const;
+
+    enum SelectionResizeType
+    {
+        None = 0,
+        Left = 1,
+        Right = 2,
+        Top = 4,
+        Bottom = 8
+    };
+
+    // Returns a bitwise OR of the SelectionResizeType's
+    int mouseOnSelectionResizeHandle (const QPoint &viewPoint = KP_INVALID_POINT) const;
+
+    bool mouseOnSelectionToSelectText (const QPoint &viewPoint = KP_INVALID_POINT) const;
+
+
+signals:
+    /**
+     * Emitted after all zooming code has been executed.
+     *
+     * @param zoomLevelX New zoomLevelX()
+     * @param zoomLevelY New zoomLevelY()
+     */
+    void zoomLevelChanged (int zoomLevelX, int zoomLevelY);
+
+    /**
+     * Emitted after all resizing code has been executed.
+     *
+     * @param size New view size.
+     */
+    void sizeChanged (const QSize &size);
+
+    /**
+     * Convenience signal - same as above.
+     *
+     * Emitted after all resizing code has been executed.
+     *
+     * @param width New view width.
+     * @param height New view height.
+     */
+    void sizeChanged (int width, int height);
+
+    /**
+     * Emitted after all origin changing code has been executed.
+     *
+     * @param origin The new origin.
+     */
+    void originChanged (const QPoint &origin);
+
+protected:
+    virtual void mouseMoveEvent (QMouseEvent *e);
+    virtual void mousePressEvent (QMouseEvent *e);
+    virtual void mouseReleaseEvent (QMouseEvent *e);
+public:
+    // (needs to be public as it may also get event from
+    //  QScrollView::contentsWheelEvent())
+    virtual void wheelEvent (QWheelEvent *e);
+
+protected:
+    virtual void keyPressEvent (QKeyEvent *e);
+    virtual void keyReleaseEvent (QKeyEvent *e);
+
+    virtual void focusInEvent (QFocusEvent *e);
+    virtual void focusOutEvent (QFocusEvent *e);
+
+    virtual void enterEvent (QEvent *e);
+    virtual void leaveEvent (QEvent *e);
+
+    virtual void dragEnterEvent (QDragEnterEvent *);
+    virtual void dragLeaveEvent (QDragLeaveEvent *);
+    
+    virtual void imStartEvent (QIMEvent *e);
+    virtual void imComposeEvent (QIMEvent *e);
+    virtual void imEndEvent (QIMEvent *e);
+
+public:
+    virtual void resize (int w, int h);
+protected:
+    virtual void resizeEvent (QResizeEvent *e);
+
+
+protected:
+    QRect paintEventGetDocRect (const QRect &viewRect) const;
+public:
+    /**
+     * Draws an opaque background representing transparency.  Currently,
+     * it draws a checkerboard.
+     *
+     * @param painter Painter.
+     * @param viewWidth Total width of the view visible to the user.
+     * @param viewHeight Total height of the view visible to the user.
+     * @param rect Rectangle to paint in relative to the painter.  Note
+     *             that this function does not clip and may draw slightly
+     *             more than the requested rectangle.  TODO: why not?
+     * @param isPreview Whether the view is for a preview as opposed to
+     *                  e.g. editing.  If set, this function may render
+     *                  slightly differently.
+     */
+    static void drawTransparentBackground (QPainter *painter,
+                                           int viewWidth, int viewHeight,
+                                           const QRect &rect,
+                                           bool isPreview = false);
+protected:
+    void paintEventDrawCheckerBoard (QPainter *painter, const QRect &viewRect);
+    void paintEventDrawSelection (QPixmap *destPixmap, const QRect &docRect);
+    bool selectionResizeHandleAtomicSizeCloseToZoomLevel () const;
+    void paintEventDrawSelectionResizeHandles (QPainter *painter, const QRect &viewRect);
+    void paintEventDrawTempPixmap (QPixmap *destPixmap, const QRect &docRect);
+    void paintEventDrawGridLines (QPainter *painter, const QRect &viewRect);
+
+    void paintEventDrawRect (const QRect &viewRect);
+    virtual void paintEvent (QPaintEvent *e);
+
+
+private:
+    struct kpViewPrivate *d;
+};
+
+
+#endif  // KP_VIEW_H