basictabbedpaneui.java

JAVA的一些源码 JAVA2 STANDARD EDITION DEVELOPMENT KIT 5.0

        Rectangle selRect = selectedIndex < 0? null :
                               getTabBounds(selectedIndex, calcRect);

        g.setColor(lightHighlight);

        // Draw unbroken line if tabs are not on TOP, OR
        // selected tab is not in run adjacent to content, OR
        // selected tab is not visible (SCROLL_TAB_LAYOUT)
        //
        if (tabPlacement != TOP || selectedIndex < 0 || 
            (selRect.y + selRect.height + 1 < y) ||
            (selRect.x < x || selRect.x > x + w)) {
            g.drawLine(x, y, x+w-2, y);
        } else {
            // Break line to show visual connection to selected tab
            g.drawLine(x, y, selRect.x - 1, y);
            if (selRect.x + selRect.width < x + w - 2) {
                g.drawLine(selRect.x + selRect.width, y, 
                           x+w-2, y);
            } else {
                g.setColor(shadow); 
                g.drawLine(x+w-2, y, x+w-2, y);
            }
        }
    }

    protected void paintContentBorderLeftEdge(Graphics g, int tabPlacement,
                                               int selectedIndex,
                                               int x, int y, int w, int h) { 
        Rectangle selRect = selectedIndex < 0? null :
                               getTabBounds(selectedIndex, calcRect);

        g.setColor(lightHighlight); 

        // Draw unbroken line if tabs are not on LEFT, OR
        // selected tab is not in run adjacent to content, OR
        // selected tab is not visible (SCROLL_TAB_LAYOUT)
        //
        if (tabPlacement != LEFT || selectedIndex < 0 ||
            (selRect.x + selRect.width + 1 < x) ||
            (selRect.y < y || selRect.y > y + h)) {
            g.drawLine(x, y, x, y+h-2);
        } else {
            // Break line to show visual connection to selected tab
            g.drawLine(x, y, x, selRect.y - 1);
            if (selRect.y + selRect.height < y + h - 2) {
                g.drawLine(x, selRect.y + selRect.height, 
                           x, y+h-2);
            } 
        }
    }

    protected void paintContentBorderBottomEdge(Graphics g, int tabPlacement,
                                               int selectedIndex,
                                               int x, int y, int w, int h) { 
        Rectangle selRect = selectedIndex < 0? null :
                               getTabBounds(selectedIndex, calcRect);

        g.setColor(shadow);

        // Draw unbroken line if tabs are not on BOTTOM, OR
        // selected tab is not in run adjacent to content, OR
        // selected tab is not visible (SCROLL_TAB_LAYOUT)
        //
        if (tabPlacement != BOTTOM || selectedIndex < 0 ||
             (selRect.y - 1 > h) ||
             (selRect.x < x || selRect.x > x + w)) {
            g.drawLine(x+1, y+h-2, x+w-2, y+h-2);
            g.setColor(darkShadow);
            g.drawLine(x, y+h-1, x+w-1, y+h-1);
        } else {
            // Break line to show visual connection to selected tab
            g.drawLine(x+1, y+h-2, selRect.x - 1, y+h-2);
            g.setColor(darkShadow);
            g.drawLine(x, y+h-1, selRect.x - 1, y+h-1);
            if (selRect.x + selRect.width < x + w - 2) {
                g.setColor(shadow);
                g.drawLine(selRect.x + selRect.width, y+h-2, x+w-2, y+h-2);
                g.setColor(darkShadow);
                g.drawLine(selRect.x + selRect.width, y+h-1, x+w-1, y+h-1);
            } 
        }

    }

    protected void paintContentBorderRightEdge(Graphics g, int tabPlacement,
                                               int selectedIndex,
                                               int x, int y, int w, int h) {
        Rectangle selRect = selectedIndex < 0? null :
                               getTabBounds(selectedIndex, calcRect);

        g.setColor(shadow);

        // Draw unbroken line if tabs are not on RIGHT, OR
        // selected tab is not in run adjacent to content, OR
        // selected tab is not visible (SCROLL_TAB_LAYOUT)
        //
        if (tabPlacement != RIGHT || selectedIndex < 0 ||
             (selRect.x - 1 > w) ||
             (selRect.y < y || selRect.y > y + h)) {
            g.drawLine(x+w-2, y+1, x+w-2, y+h-3);
            g.setColor(darkShadow);
            g.drawLine(x+w-1, y, x+w-1, y+h-1);
        } else {
            // Break line to show visual connection to selected tab
            g.drawLine(x+w-2, y+1, x+w-2, selRect.y - 1);
            g.setColor(darkShadow);
            g.drawLine(x+w-1, y, x+w-1, selRect.y - 1);

            if (selRect.y + selRect.height < y + h - 2) {
                g.setColor(shadow);
                g.drawLine(x+w-2, selRect.y + selRect.height, 
                           x+w-2, y+h-2);
                g.setColor(darkShadow);
                g.drawLine(x+w-1, selRect.y + selRect.height, 
                           x+w-1, y+h-2);
            } 
        }
    }

    private void ensureCurrentLayout() {
        if (!tabPane.isValid()) {
            tabPane.validate();
        } 
        /* If tabPane doesn't have a peer yet, the validate() call will
         * silently fail.  We handle that by forcing a layout if tabPane
         * is still invalid.  See bug 4237677.
         */
        if (!tabPane.isValid()) {
            TabbedPaneLayout layout = (TabbedPaneLayout)tabPane.getLayout();
            layout.calculateLayoutInfo();          
        }
    }       
    

// TabbedPaneUI methods

    /**
     * Returns the bounds of the specified tab index.  The bounds are
     * with respect to the JTabbedPane's coordinate space.
     */
    public Rectangle getTabBounds(JTabbedPane pane, int i) { 
        ensureCurrentLayout();
        Rectangle tabRect = new Rectangle();
        return getTabBounds(i, tabRect);
    }

    public int getTabRunCount(JTabbedPane pane) {
        ensureCurrentLayout();
        return runCount;
    }

    /**
     * Returns the tab index which intersects the specified point
     * in the JTabbedPane's coordinate space.
     */
    public int tabForCoordinate(JTabbedPane pane, int x, int y) {
        return tabForCoordinate(pane, x, y, true);
    }

    private int tabForCoordinate(JTabbedPane pane, int x, int y,
                                 boolean validateIfNecessary) {
        if (validateIfNecessary) {
            ensureCurrentLayout();
        }
        if (isRunsDirty) {
            // We didn't recalculate the layout, runs and tabCount may not
            // line up, bail.
            return -1;
        }
        Point p = new Point(x, y);

        if (scrollableTabLayoutEnabled()) {
            translatePointToTabPanel(x, y, p);
            Rectangle viewRect = tabScroller.viewport.getViewRect();
            if (!viewRect.contains(p)) {
                return -1;
            }
        }
        int tabCount = tabPane.getTabCount();
        for (int i = 0; i < tabCount; i++) {
            if (rects[i].contains(p.x, p.y)) {
                return i;
            }
        }
        return -1;
    }

    /**
     * Returns the bounds of the specified tab in the coordinate space
     * of the JTabbedPane component.  This is required because the tab rects
     * are by default defined in the coordinate space of the component where
     * they are rendered, which could be the JTabbedPane
     * (for WRAP_TAB_LAYOUT) or a ScrollableTabPanel (SCROLL_TAB_LAYOUT).
     * This method should be used whenever the tab rectangle must be relative
     * to the JTabbedPane itself and the result should be placed in a
     * designated Rectangle object (rather than instantiating and returning
     * a new Rectangle each time). The tab index parameter must be a valid 
     * tabbed pane tab index (0 to tab count - 1, inclusive).  The destination
     * rectangle parameter must be a valid <code>Rectangle</code> instance.
     * The handling of invalid parameters is unspecified.
     *
     * @param tabIndex the index of the tab
     * @param dest the rectangle where the result should be placed
     * @return the resulting rectangle
     *
     * @since 1.4
     */
    protected Rectangle getTabBounds(int tabIndex, Rectangle dest) {
        dest.width = rects[tabIndex].width;
        dest.height = rects[tabIndex].height;

        if (scrollableTabLayoutEnabled()) { // SCROLL_TAB_LAYOUT
            // Need to translate coordinates based on viewport location & 
            // view position
            Point vpp = tabScroller.viewport.getLocation();
            Point viewp = tabScroller.viewport.getViewPosition();
            dest.x = rects[tabIndex].x + vpp.x - viewp.x;
            dest.y = rects[tabIndex].y + vpp.y - viewp.y;

        } else { // WRAP_TAB_LAYOUT
            dest.x = rects[tabIndex].x;
            dest.y = rects[tabIndex].y;
        }
        return dest;
    }

    /**
     * Returns the index of the tab closest to the passed in location, note
     * that the returned tab may not contain the location x,y.
     */
    private int getClosestTab(int x, int y) {
        int min = 0;
        int tabCount = Math.min(rects.length, tabPane.getTabCount());
        int max = tabCount;
        int tabPlacement = tabPane.getTabPlacement();
        boolean useX = (tabPlacement == TOP || tabPlacement == BOTTOM);
        int want = (useX) ? x : y;

        while (min != max) {
            int current = (max + min) / 2;
            int minLoc;
            int maxLoc;

            if (useX) {
                minLoc = rects[current].x;
                maxLoc = minLoc + rects[current].width;
            }
            else {
                minLoc = rects[current].y;
                maxLoc = minLoc + rects[current].height;
            }
            if (want < minLoc) {
                max = current;
                if (min == max) {
                    return Math.max(0, current - 1);
                }
            }
            else if (want >= maxLoc) {
                min = current;
                if (max - min <= 1) {
                    return Math.max(current + 1, tabCount - 1);
                }
            }
            else {
                return current;
            }
        }
        return min;
    }

    /**
     * Returns a point which is translated from the specified point in the
     * JTabbedPane's coordinate space to the coordinate space of the
     * ScrollableTabPanel.  This is used for SCROLL_TAB_LAYOUT ONLY.
     */
    private Point translatePointToTabPanel(int srcx, int srcy, Point dest) {
        Point vpp = tabScroller.viewport.getLocation();
        Point viewp = tabScroller.viewport.getViewPosition();
        dest.x = srcx - vpp.x + viewp.x;
        dest.y = srcy - vpp.y + viewp.y;
        return dest;
    }

// BasicTabbedPaneUI methods

    protected Component getVisibleComponent() {
        return visibleComponent;
    }

    protected void setVisibleComponent(Component component) {
        if (visibleComponent != null && visibleComponent != component &&
                visibleComponent.getParent() == tabPane) {
            visibleComponent.setVisible(false);
        }
        if (component != null && !component.isVisible()) {
            component.setVisible(true);
        }
        visibleComponent = component;
    }

    protected void assureRectsCreated(int tabCount) {
        int rectArrayLen = rects.length; 
        if (tabCount != rectArrayLen ) {
            Rectangle[] tempRectArray = new Rectangle[tabCount];
            System.arraycopy(rects, 0, tempRectArray, 0, 
                             Math.min(rectArrayLen, tabCount));
            rects = tempRectArray;
            for (int rectIndex = rectArrayLen; rectIndex < tabCount; rectIndex++) {
                rects[rectIndex] = new Rectangle();
            }
        } 

    }

    protected void expandTabRunsArray() {
        int rectLen = tabRuns.length;
        int[] newArray = new int[rectLen+10];
        System.arraycopy(tabRuns, 0, newArray, 0, runCount);
        tabRuns = newArray;
    }

    protected int getRunForTab(int tabCount, int tabIndex) {
        for (int i = 0; i < runCount; i++) {
            int first = tabRuns[i];
            int last = lastTabInRun(tabCount, i);
            if (tabIndex >= first && tabIndex <= last) {
                return i;
            }
        }
        return 0;
    }

    protected int lastTabInRun(int tabCount, int run) {
        if (runCount == 1) {
            return tabCount - 1;
        }
        int nextRun = (run == runCount - 1? 0 : run + 1);
        if (tabRuns[nextRun] == 0) {
            return tabCount - 1;
        }
        return tabRuns[nextRun]-1;
    }

    protected int getTabRunOverlay(int tabPlacement) {
        return tabRunOverlay;
    }

    protected int getTabRunIndent(int tabPlacement, int run) {
        return 0;
    }

    protected boolean shouldPadTabRun(int tabPlacement, int run) {
        return runCount > 1;
    }

    protected boolean shouldRotateTabRuns(int tabPlacement) {
        return true;
    }

    protected Icon getIconForTab(int tabIndex) {
        return (!tabPane.isEnabled() || !tabPane.isEnabledAt(tabIndex))?
                          tabPane.getDisabledIconAt(tabIndex) : tabPane.getIconAt(tabIndex);
    }

    /** 
     * Returns the text View object required to render stylized text (HTML) for
     * the specified tab or null if no specialized text rendering is needed