Wt::WTree

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最新推荐文章于 2025-05-25 16:01:15 发布

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文章标签： c/c++ python 测试

原文链接：https://my.oschina.net/zhmsong/blog/5227

2019独角兽企业重金招聘Python工程师标准>>>

A widget that represents a navigatable tree.

【这个 Widget 是一棵导航树。】

WTree provides a tree widget, and coordinates selection functionality.

〔WTree 提供了树形 widget，并提供了对选中方式、是否选中等的一系列操作。〕

Unlike the MVC-based WTreeView, the tree renders a widget hierarchy, rather than a hierarhical standard model. This provides extra flexibility (as any widget can be used as contents), at the cost of server-side, client-side and bandwidth resources (especially for large tree tables).

〔与基于 MVC 的 WTreeView 不同，WTree 渲染的是一个具有层次特征的 widget，而不是层级关系的标准数据模型。WTree 具有一定的灵活性，主要体现在服务器端、客户端和带宽资源的使用上，特别对于较大的树表；另外任何 widget 都可以作为树的一个分支出现。〕

The tree is implemented as a hierarchy of WTreeNode widgets.

〔最终的树结构具体将是由具有层次关系的 WTreeNode widgets。〕

Selection is rendered by calling WTreeNode::renderSelected(bool). Only tree nodes that are selectable may participate in the selection.

〔选中动作是通过调用 WTreeNode::renderSelected(bool) 实现的，也就是说树中的节点只有是可选的，才可能参与选中事件。〕

Usage example:

Wt::WIconPair *folderIcon = new Wt::WIconPair("icons/yellow-folder-closed.png",
"icons/yellow-folder-open.png", false);

Wt::WTree *tree = new Wt::WTree();
 tree->setSelectionMode(Wt::SingleSelection);

Wt::WTreeNode *root = new Wt::WTreeNode("Tree root", folderIcon);
 root->setStyleClass("example-tree");
 tree->setTreeRoot(root);
 root->label()->setTextFormat(Wt::PlainText);
 root->setImagePack("resources/");
 root->setLoadPolicy(Wt::WTreeNode::NextLevelLoading);
 root->addChildNode(new Wt::WTreeNode("one"));
 root->addChildNode(new Wt::WTreeNode("two"));

Wt::WTreeNode *three = new Wt::WTreeNode("three");
 three->addChildNode(new WTreeNode("three: one"));
 three->addChildNode(new WTreeNode("three: two"));
 root->addChildNode(three);

 root->expand();

CSS〔表现样式〕

The tree is styled by the current CSS theme. The look can be overridden using the Wt-tree CSS class. The style selectors that affect the rendering of the decoration of the nodes are indicated in the documentation for WTreeNode. In addition, the following selector may be used to style the header:

.Wt-tree .Wt-selected : selected item

〔〕

A screenshot of the tree:

An example WTree (default)

An example WTree (polished)

See also:

WTreeNode, WTreeTable, WTreeView

WTree 定义的主要接口实现的功能有：
1、根节点操作：定义和返回哪个WTreeNode为根节点；
2、选中方式操作：定义和返回WTreeNode节点被选中的方式，主要有

enum Wt::SelectionMode Enumerator:

NoSelection	No selections.(不能选中)
SingleSelection	Single selection only.（只能单选）
ExtendedSelection	Multiple selection.（可多选）