樹(shù)節(jié)點(diǎn)渲染器示例ppt課件

1、擴(kuò)展DefaultTreeCellRenderer創(chuàng)建本人的樹(shù)節(jié)點(diǎn)渲染器例如何楊2019/02/20本文內(nèi)容 本文將講述如何擴(kuò)展DefaultTreeCellRenderer創(chuàng)建本人的樹(shù)節(jié)點(diǎn)渲染器。原有方法，缺陷：靈敏性不高o / 設(shè)定葉節(jié)點(diǎn)圖標(biāo) Icon leafIcon = new ImageIcon(TreeViewPanel.class .getResource(/leaf.gif); / 設(shè)定封鎖形狀節(jié)點(diǎn)圖標(biāo) Icon closedIcon = new ImageIcon(TreeViewPanel.class .getResource(/close.gif); / 設(shè)定翻開(kāi)形狀節(jié)點(diǎn)

2、圖標(biāo) Icon openIcon = new ImageIcon(TreeViewPanel.class .getResource(/open.gif); / 獲得樹(shù)的渲染器 DefaultTreeCellRenderer renderer = (DefaultTreeCellRenderer) tree .getCellRenderer(); / 設(shè)定葉節(jié)點(diǎn)圖標(biāo) renderer.setLeafIcon(leafIcon); / 設(shè)定封鎖形狀節(jié)點(diǎn)圖標(biāo) renderer.setClosedIcon(closedIcon); / 設(shè)定翻開(kāi)形狀節(jié)點(diǎn)圖標(biāo) renderer.setOpenIcon(o

3、penIcon); 剛剛的代碼無(wú)法實(shí)現(xiàn)以下效果擴(kuò)展DefaultTreeCellRenderer創(chuàng)建本人的樹(shù)節(jié)點(diǎn)渲染器 opublic class TreeNodeRenderer extends DefaultTreeCellRenderero private static final long serialVersionUID = 8532405600839140757L;o o / 數(shù)據(jù)庫(kù)圖標(biāo),頂層節(jié)點(diǎn)用o private static final Icon databaseIcon = new ImageIcon(TreeNodeRenderer.classo .getResource

4、(/database.gif);o o / 表圖標(biāo),第三層節(jié)點(diǎn)用o private static final Icon tableIcon = new ImageIcon(TreeNodeRenderer.classo .getResource(/leaf.gif);o o / 表空間關(guān)閉狀態(tài)圖標(biāo),關(guān)閉狀態(tài)的第二層節(jié)點(diǎn)用o private static final Icon tableSpaceCloseIcon = new ImageIcon(TreeNodeRenderer.classo .getResource(/close.gif);o o / 表空間關(guān)閉狀態(tài)圖標(biāo),打開(kāi)狀態(tài)的第二層節(jié)點(diǎn)

5、用o private static final Icon tableSpaceOpenIcon = new ImageIcon(TreeNodeRenderer.classo .getResource(/open.gif);o public Component getTreeCellRendererComponent(JTree tree,o Object value,o boolean sel,o boolean expanded,o boolean leaf,o int row,o boolean hasFocus)o super.getTreeCellRendererComponent(

6、tree, o value,o sel, o expanded, o leaf, o row, o hasFocus); o / 獲得節(jié)點(diǎn)o DefaultMutableTreeNode node=(DefaultMutableTreeNode)value;o o / 獲得路徑o TreeNode paths = node.getPath();o o / 按途徑層次賦予不同的圖標(biāo)o if (paths.length = 3) o setIcon(tableIcon);o else if(paths.length = 2)o / 按展開(kāi)情況再賦予不同的圖標(biāo)o if(expanded)o setIcon(tableSpaceOpenIcon);o o elseo setIcon(tableSpaceCloseIcon);o o o else if(paths.length = 1)o