basictreeui.java

JAVA 所有包

        if (rect.y != 0) {
            rect.y--;
        }

        if (!ltr) {
            rect.x = rect.x + rect.width - 100;
        }

        rect.width = 100;
        rect.height = 2;

        return rect;
    }

    /**
     * Paints the horizontal part of the leg. The receiver should
     * NOT modify <code>clipBounds</code>, or <code>insets</code>.<p>
     * NOTE: <code>parentRow</code> can be -1 if the root is not visible.
     */
    protected void paintHorizontalPartOfLeg(Graphics g, Rectangle clipBounds,
					    Insets insets, Rectangle bounds,
					    TreePath path, int row,
					    boolean isExpanded,
					    boolean hasBeenExpanded, boolean
					    isLeaf) {
	if (!paintLines) {
	    return;
	}

        // Don't paint the legs for the root'ish node if the
        int depth = path.getPathCount() - 1;
	if((depth == 0 || (depth == 1 && !isRootVisible())) &&
	   !getShowsRootHandles()) {
	    return;
        }

	int clipLeft = clipBounds.x;
	int clipRight = clipBounds.x + (clipBounds.width - 1);
	int clipTop = clipBounds.y;
	int clipBottom = clipBounds.y + (clipBounds.height - 1);
	int lineY = bounds.y + bounds.height / 2;
	// Offset leftX from parents indent.
	if (leftToRight) {
	    int leftX = bounds.x - getRightChildIndent();
	    int nodeX = bounds.x - getHorizontalLegBuffer();
	
	    if(lineY >= clipTop && lineY <= clipBottom && nodeX >= clipLeft &&
	                                                 leftX <= clipRight ) {
	        leftX = Math.max(Math.max(insets.left, leftX), clipLeft);
		nodeX = Math.min(Math.max(insets.left, nodeX), clipRight);

                if (leftX != nodeX) {
                    g.setColor(getHashColor());
                    paintHorizontalLine(g, tree, lineY, leftX, nodeX);
                }
	    }
	}
	else {
	    int leftX = bounds.x + bounds.width + getRightChildIndent();
	    int nodeX = bounds.x + bounds.width + 
	                                  getHorizontalLegBuffer() - 1;

	    if(lineY >= clipTop && lineY <= clipBottom &&
	       leftX >= clipLeft && nodeX <= clipRight) {
	        leftX = Math.min(leftX, clipRight);
		nodeX = Math.max(nodeX, clipLeft);

		g.setColor(getHashColor());
		paintHorizontalLine(g, tree, lineY, nodeX, leftX);
	    }
	}
    }

    /**
     * Paints the vertical part of the leg. The receiver should
     * NOT modify <code>clipBounds</code>, <code>insets</code>.<p>
     */
    protected void paintVerticalPartOfLeg(Graphics g, Rectangle clipBounds,
					  Insets insets, TreePath path) {
	if (!paintLines) {
	    return;
	}

        int depth = path.getPathCount() - 1;
	if (depth == 0 && !getShowsRootHandles() && !isRootVisible()) {
	    return;
        }
	int lineX = getRowX(-1, depth + 1);
	if (leftToRight) {
            lineX = lineX - getRightChildIndent() + insets.left;
	}
	else {
            lineX = tree.getWidth() - lineX - insets.right +
                    getRightChildIndent();
	}
	int clipLeft = clipBounds.x;
	int clipRight = clipBounds.x + (clipBounds.width - 1);

	if (lineX >= clipLeft && lineX <= clipRight) {
	    int clipTop = clipBounds.y;
	    int clipBottom = clipBounds.y + clipBounds.height;
	    Rectangle parentBounds = getPathBounds(tree, path);
	    Rectangle lastChildBounds = getPathBounds(tree,
						     getLastChildPath(path));

	    if(lastChildBounds == null)
		// This shouldn't happen, but if the model is modified
		// in another thread it is possible for this to happen.
		// Swing isn't multithreaded, but I'll add this check in
		// anyway.
		return;

	    int       top;

	    if(parentBounds == null) {
		top = Math.max(insets.top + getVerticalLegBuffer(),
			       clipTop);
	    }
	    else
		top = Math.max(parentBounds.y + parentBounds.height +
			       getVerticalLegBuffer(), clipTop);
	    if(depth == 0 && !isRootVisible()) {
		TreeModel      model = getModel();

		if(model != null) {
		    Object        root = model.getRoot();

		    if(model.getChildCount(root) > 0) {
			parentBounds = getPathBounds(tree, path.
				  pathByAddingChild(model.getChild(root, 0)));
			if(parentBounds != null)
			    top = Math.max(insets.top + getVerticalLegBuffer(),
					   parentBounds.y +
					   parentBounds.height / 2);
		    }
		}
	    }

	    int bottom = Math.min(lastChildBounds.y +
				  (lastChildBounds.height / 2), clipBottom);

            if (top <= bottom) {
                g.setColor(getHashColor());
                paintVerticalLine(g, tree, lineX, top, bottom);
            }
	}
    }

    /**
     * Paints the expand (toggle) part of a row. The receiver should
     * NOT modify <code>clipBounds</code>, or <code>insets</code>.
     */
    protected void paintExpandControl(Graphics g,
				      Rectangle clipBounds, Insets insets,
				      Rectangle bounds, TreePath path,
				      int row, boolean isExpanded,
				      boolean hasBeenExpanded,
				      boolean isLeaf) {
	Object       value = path.getLastPathComponent();

	// Draw icons if not a leaf and either hasn't been loaded,
	// or the model child count is > 0.
	if (!isLeaf && (!hasBeenExpanded ||
			treeModel.getChildCount(value) > 0)) {
	    int middleXOfKnob;
	    if (leftToRight) {
	        middleXOfKnob = bounds.x - (getRightChildIndent() - 1);
	    }
	    else {
	        middleXOfKnob = bounds.x + bounds.width + getRightChildIndent();
	    }
	    int middleYOfKnob = bounds.y + (bounds.height / 2);

	    if (isExpanded) {
		Icon expandedIcon = getExpandedIcon();
		if(expandedIcon != null)
		  drawCentered(tree, g, expandedIcon, middleXOfKnob,
			       middleYOfKnob );
	    }
	    else {
		Icon collapsedIcon = getCollapsedIcon();
		if(collapsedIcon != null)
		  drawCentered(tree, g, collapsedIcon, middleXOfKnob,
			       middleYOfKnob);
	    }
	}
    }

    /**
     * Paints the renderer part of a row. The receiver should
     * NOT modify <code>clipBounds</code>, or <code>insets</code>.
     */
    protected void paintRow(Graphics g, Rectangle clipBounds,
			    Insets insets, Rectangle bounds, TreePath path,
			    int row, boolean isExpanded,
			    boolean hasBeenExpanded, boolean isLeaf) {
	// Don't paint the renderer if editing this row.
	if(editingComponent != null && editingRow == row)
	    return;

	int leadIndex;

	if(tree.hasFocus()) {
	    leadIndex = getLeadSelectionRow();
	}
	else
	    leadIndex = -1;

	Component component;

	component = currentCellRenderer.getTreeCellRendererComponent
	              (tree, path.getLastPathComponent(),
                       tree.isRowSelected(row), isExpanded, isLeaf, row,
		       (leadIndex == row));
	
	rendererPane.paintComponent(g, component, tree, bounds.x, bounds.y,
				    bounds.width, bounds.height, true);
    }

    /**
     * Returns true if the expand (toggle) control should be drawn for
     * the specified row.
     */
    protected boolean shouldPaintExpandControl(TreePath path, int row,
					       boolean isExpanded,
					       boolean hasBeenExpanded,
					       boolean isLeaf) {
	if(isLeaf)
	    return false;

	int              depth = path.getPathCount() - 1;

	if((depth == 0 || (depth == 1 && !isRootVisible())) &&
	   !getShowsRootHandles())
	    return false;
	return true;
    }

    /**
     * Paints a vertical line.
     */
    protected void paintVerticalLine(Graphics g, JComponent c, int x, int top,
				    int bottom) {
	if (lineTypeDashed) {
	    drawDashedVerticalLine(g, x, top, bottom);
	} else {
	    g.drawLine(x, top, x, bottom);
	}
    }

    /**
     * Paints a horizontal line.
     */
    protected void paintHorizontalLine(Graphics g, JComponent c, int y,
				      int left, int right) {
	if (lineTypeDashed) {
	    drawDashedHorizontalLine(g, y, left, right);
	} else {
	    g.drawLine(left, y, right, y);
	}
    }

    /**
     * The vertical element of legs between nodes starts at the bottom of the
     * parent node by default.  This method makes the leg start below that.
     */
    protected int getVerticalLegBuffer() {
	return 0;
    } 

    /**
     * The horizontal element of legs between nodes starts at the
     * right of the left-hand side of the child node by default.  This
     * method makes the leg end before that.
     */
    protected int getHorizontalLegBuffer() {
	return 0;
    } 

    //
    // Generic painting methods
    //

    // Draws the icon centered at (x,y)
    protected void drawCentered(Component c, Graphics graphics, Icon icon,
				int x, int y) {
	icon.paintIcon(c, graphics, x - icon.getIconWidth()/2, y -
		       icon.getIconHeight()/2);
    }

    // This method is slow -- revisit when Java2D is ready.
    // assumes x1 <= x2
    protected void drawDashedHorizontalLine(Graphics g, int y, int x1, int x2){
	// Drawing only even coordinates helps join line segments so they
	// appear as one line.  This can be defeated by translating the
	// Graphics by an odd amount.
	x1 += (x1 % 2);

	for (int x = x1; x <= x2; x+=2) {
	    g.drawLine(x, y, x, y);
	}
    }

    // This method is slow -- revisit when Java2D is ready.
    // assumes y1 <= y2
    protected void drawDashedVerticalLine(Graphics g, int x, int y1, int y2) {
	// Drawing only even coordinates helps join line segments so they
	// appear as one line.  This can be defeated by translating the
	// Graphics by an odd amount.
	y1 += (y1 % 2);

	for (int y = y1; y <= y2; y+=2) {
	    g.drawLine(x, y, x, y);
	}
    }

    //
    // Various local methods
    //

    /**
     * Returns the location, along the x-axis, to render a particular row
     * at. The return value does not include any Insets specified on the JTree.
     * This does not check for the validity of the row or depth, it is assumed
     * to be correct and will not throw an Exception if the row or depth
     * doesn't match that of the tree.
     *
     * @param row Row to return x location for
     * @param depth Depth of the row
     * @return amount to indent the given row.
     * @since 1.5
     */
    protected int getRowX(int row, int depth) {
        return totalChildIndent * (depth + depthOffset);
    }

    /**
     * Makes all the nodes that are expanded in JTree expanded in LayoutCache.
     * This invokes updateExpandedDescendants with the root path.
     */
    protected void updateLayoutCacheExpandedNodes() {
	if(treeModel != null && treeModel.getRoot() != null)
	    updateExpandedDescendants(new TreePath(treeModel.getRoot()));
    }

    /**
     * Updates the expanded state of all the descendants of <code>path</code>
     * by getting the expanded descendants from the tree and forwarding
     * to the tree state.
     */
    protected void updateExpandedDescendants(TreePath path) {
	completeEditing();
	if(treeState != null) {
	    treeState.setExpandedState(path, true);

	    Enumeration   descendants = tree.getExpandedDescendants(path);

	    if(descendants != null) {
		while(descendants.hasMoreElements()) {
		    path = (TreePath)descendants.nextElement();
		    treeState.setExpandedState(path, true);
		}
	    }
	    updateLeadRow();
	    updateSize();
	}
    }

    /**
     * Returns a path to the last child of <code>parent</code>.
     */
    protected TreePath getLastChildPath(TreePath parent) {
	if(treeModel != null) {
	    int         childCount = treeModel.getChildCount
		(parent.getLastPathComponent());
	    
	    if(childCount > 0)
		return parent.pathByAddingChild(treeModel.getChild
			   (parent.getLastPathComponent(), childCount - 1));
	}
	return null;
    }

    /**
     * Updates how much each depth should be offset by.
     */
    protected void updateDepthOffset() {
	if(isRootVisible()) {
	    if(getShowsRootHandles())
		depthOffset = 1;
	    else
		depthOffset = 0;
	}
	else if(!getShowsRootHandles())
	    depthOffset = -1;
	else
	    depthOffset = 0;
    }

    /** 
      * Updates the cellEditor based on the editability of the JTree that
      * we're contained in.  If the tree is editable but doesn't have a
      * cellEditor, a basic one will be used.
      */
    protected void updateCellEditor() {
	TreeCellEditor        newEditor;

	completeEditing();
	if(tree == null)
	    newEditor = null;
	else {
	    if(tree.isEditable()) {
		newEditor = tree.getCellEditor();
		if(newEditor == null) {
		    newEditor = createDefaultCellEditor();
		    if(newEditor != null) {
			tree.setCellEditor(newEditor);
			createdCellEditor = true;
		    }
		}
	    }
	    else
		newEditor = null;
	}
	if(newEditor != cellEditor) {
	    if(cellEditor != null && cellEditorListener != null)
		cellEditor.removeCellEditorListener(cellEditorListener);