synthtabbedpaneui.java

Mobile 应用程序使用 Java Micro Edition (Java ME) 平台

        tabContext.getPainter().paintTabbedPaneTabBorder(tabContext, g,
                x, y, width, height, tabIndex, placement);
        
        if (tabPane.getTabComponentAt(tabIndex) == null) {
            String title = tabPane.getTitleAt(tabIndex);
            Font font = ss.getStyle().getFont(ss);
            FontMetrics metrics = SwingUtilities2.getFontMetrics(tabPane, g, font);
            Icon icon = getIconForTab(tabIndex);

            layoutLabel(ss, tabPlacement, metrics, tabIndex, title, icon,
                    tabRect, iconRect, textRect, isSelected);

            paintText(ss, g, tabPlacement, font, metrics,
                    tabIndex, title, textRect, isSelected);

            paintIcon(g, tabPlacement, tabIndex, icon, iconRect, isSelected);
        }
    }

    protected void layoutLabel(SynthContext ss, int tabPlacement, 
                               FontMetrics metrics, int tabIndex,
                               String title, Icon icon,
                               Rectangle tabRect, Rectangle iconRect, 
                               Rectangle textRect, boolean isSelected ) {
	View v = getTextViewForTab(tabIndex);
	if (v != null) {
	    tabPane.putClientProperty("html", v);
	}

        textRect.x = textRect.y = iconRect.x = iconRect.y = 0;

        ss.getStyle().getGraphicsUtils(ss).layoutText(ss, metrics, title,
                         icon, SwingUtilities.CENTER, SwingUtilities.CENTER,
                         SwingUtilities.LEADING, SwingUtilities.TRAILING,
                         tabRect, iconRect, textRect, textIconGap);

	tabPane.putClientProperty("html", null);

        int xNudge = getTabLabelShiftX(tabPlacement, tabIndex, isSelected);
        int yNudge = getTabLabelShiftY(tabPlacement, tabIndex, isSelected);
        iconRect.x += xNudge;
        iconRect.y += yNudge;
        textRect.x += xNudge;
        textRect.y += yNudge;
    }

    protected void paintText(SynthContext ss,
                             Graphics g, int tabPlacement,
                             Font font, FontMetrics metrics, int tabIndex,
                             String title, Rectangle textRect, 
                             boolean isSelected) {
        g.setFont(font);

	View v = getTextViewForTab(tabIndex);
	if (v != null) {
	    // html
	    v.paint(g, textRect);
	} else {
	    // plain text
            int mnemIndex = tabPane.getDisplayedMnemonicIndexAt(tabIndex);

            g.setColor(ss.getStyle().getColor(ss, ColorType.TEXT_FOREGROUND));
            ss.getStyle().getGraphicsUtils(ss).paintText(ss, g, title,
                                  textRect, mnemIndex);
	}
    } 


    protected void paintContentBorder(SynthContext ss, Graphics g,
                                      int tabPlacement, int selectedIndex) {
        int width = tabPane.getWidth();
        int height = tabPane.getHeight();
        Insets insets = tabPane.getInsets();

        int x = insets.left;
        int y = insets.top;
        int w = width - insets.right - insets.left;
        int h = height - insets.top - insets.bottom;

        switch(tabPlacement) {
          case LEFT:
              x += calculateTabAreaWidth(tabPlacement, runCount, maxTabWidth);
              w -= (x - insets.left);
              break;
          case RIGHT:
              w -= calculateTabAreaWidth(tabPlacement, runCount, maxTabWidth);
              break;            
          case BOTTOM: 
              h -= calculateTabAreaHeight(tabPlacement, runCount, maxTabHeight);
              break;
          case TOP:
          default:
              y += calculateTabAreaHeight(tabPlacement, runCount, maxTabHeight);
              h -= (y - insets.top);
        }
        SynthLookAndFeel.updateSubregion(ss, g, new Rectangle(x, y, w, h));
        ss.getPainter().paintTabbedPaneContentBackground(ss, g, x, y,
                                                           w, h);
        ss.getPainter().paintTabbedPaneContentBorder(ss, g, x, y, w, h);
    }
         
    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();
        }
    }
    

    protected int calculateMaxTabHeight(int tabPlacement) {
        FontMetrics metrics = getFontMetrics(tabContext.getStyle().getFont(
                                             tabContext));
        int tabCount = tabPane.getTabCount();
        int result = 0; 
        int fontHeight = metrics.getHeight();
        for(int i = 0; i < tabCount; i++) {
            result = Math.max(calculateTabHeight(tabPlacement, i, fontHeight), result);
        }
        return result; 
    }

    protected int calculateTabWidth(int tabPlacement, int tabIndex,
                                    FontMetrics metrics) {
        Icon icon = getIconForTab(tabIndex);
        Insets tabInsets = getTabInsets(tabPlacement, tabIndex);
        int width = tabInsets.left + tabInsets.right + 3;
        Component tabComponent = tabPane.getTabComponentAt(tabIndex);
        if (tabComponent != null) {
            width += tabComponent.getPreferredSize().width;
        } else {
            if (icon != null) {
                width += icon.getIconWidth() + textIconGap;
            }
            View v = getTextViewForTab(tabIndex);
            if (v != null) {
                // html
                width += (int) v.getPreferredSpan(View.X_AXIS);
            } else {
                // plain text
                String title = tabPane.getTitleAt(tabIndex);
                width += tabContext.getStyle().getGraphicsUtils(tabContext).
                        computeStringWidth(tabContext, metrics.getFont(),
                                metrics, title);
            }
        }
        return width;
    }

    protected int calculateMaxTabWidth(int tabPlacement) {
        FontMetrics metrics = getFontMetrics(tabContext.getStyle().getFont(
                                     tabContext));
        int tabCount = tabPane.getTabCount();
        int result = 0; 
        for(int i = 0; i < tabCount; i++) {
            result = Math.max(calculateTabWidth(tabPlacement, i, metrics),
                              result);
        }
        return result; 
    }

    protected Insets getTabInsets(int tabPlacement, int tabIndex) {
        updateTabContext(tabIndex, false, false, false,
                          (getFocusIndex() == tabIndex));
        return tabInsets;
    }

    protected FontMetrics getFontMetrics() {
        return getFontMetrics(tabContext.getStyle().getFont(tabContext));
    }

    protected FontMetrics getFontMetrics(Font font) {
        return tabPane.getFontMetrics(font);
    }

    private void updateTabContext(int index, boolean selected,
                                  boolean isMouseDown, boolean isMouseOver, boolean hasFocus) {
        int state = 0;
        if (!tabPane.isEnabled() || !tabPane.isEnabledAt(index)) {
	    state |= SynthConstants.DISABLED;
            if (selected) {
                state |= SynthConstants.SELECTED;
            }
        }
        else if (selected) {
            state |= (SynthConstants.ENABLED | SynthConstants.SELECTED);
            if (isMouseOver && UIManager.getBoolean("TabbedPane.isTabRollover")) {
                state |= SynthConstants.MOUSE_OVER;
            }
        }
        else if (isMouseOver) {
            state |= (SynthConstants.ENABLED | SynthConstants.MOUSE_OVER);
        }
        else {
            state = SynthLookAndFeel.getComponentState(tabPane);
	    state &= ~SynthConstants.FOCUSED; // don't use tabbedpane focus state
        }
	if (hasFocus && tabPane.hasFocus()) {
	    state |= SynthConstants.FOCUSED; // individual tab has focus
	}
        if (isMouseDown) {
            state |= SynthConstants.PRESSED;
        }

	tabContext.setComponentState(state);
    }
    
    /**
     * @inheritDoc
     * 
     * Overridden to create a TabbedPaneLayout subclass which takes into
     * account tabOverlap.
     */
    @Override protected LayoutManager createLayoutManager() {
        if (tabPane.getTabLayoutPolicy() == JTabbedPane.SCROLL_TAB_LAYOUT) {
            return super.createLayoutManager();
        } else { /* WRAP_TAB_LAYOUT */
            return new TabbedPaneLayout() {
                @Override
                public void calculateLayoutInfo() {
                    super.calculateLayoutInfo();
                    //shift all the tabs, if necessary
                    if (tabOverlap != 0) {
                        int tabCount = tabPane.getTabCount(); 
                        //left-to-right/right-to-left only affects layout
                        //when placement is TOP or BOTTOM
                        boolean ltr = tabPane.getComponentOrientation().isLeftToRight();
                        for (int i = runCount - 1; i >= 0; i--) {
                            int start = tabRuns[i];
                            int next = tabRuns[(i == runCount - 1)? 0 : i + 1];
                            int end = (next != 0? next - 1: tabCount - 1);
                            for (int j = start+1; j <= end; j++) {
                                // xshift and yshift represent the amount &
                                // direction to shift the tab in their
                                // respective axis.
                                int xshift = 0;
                                int yshift = 0;
                                // configure xshift and y shift based on tab
                                // position and ltr/rtl
                                switch (tabPane.getTabPlacement()) {
                                    case JTabbedPane.TOP:
                                    case JTabbedPane.BOTTOM:
                                        xshift = ltr ? tabOverlap : -tabOverlap;
                                        break;
                                    case JTabbedPane.LEFT:
                                    case JTabbedPane.RIGHT:
                                        yshift = tabOverlap;
                                        break;
                                    default: //do nothing
                                }
                                rects[j].x += xshift;
                                rects[j].y += yshift;
                                rects[j].width += Math.abs(xshift);
                                rects[j].height += Math.abs(yshift);
                            }
                        }
                    }
                }
            };
        }
    }
    
    private class SynthScrollableTabButton extends SynthArrowButton implements
            UIResource {
        public SynthScrollableTabButton(int direction) {
            super(direction);
        }
    }
}