The Selection object includes the TypeText method, which is used to pass a string of characters to the document at the current cursor location.
Selection对象有一个TypeText方法，用于在当前光标位置输入一个文字串。
Depending on the selection (Source in this case), the number of options available changes on the menu that pops up when the user drops the cursor on the Diagram surface.
依赖于用户的选择(本实例中为Source)，当用户在图表上下移光标时，弹出菜单上可用选项的数量会随之改变。
If the selection UI service has a locked selection, or if there is no location property on the control, the default arrow cursor will be set.
如果选择UI服务有锁定的选择，或者如果控件上没有位置属性，将会设置默认箭头游标。
OnSelectionChange - fired when the actual selection in the editor area changes (including cursor position and keystrokes).
当编辑器中实际的选择区域发生变化时(包括光标位置和按键)。
To copy the selection into the image at its current location, click outside the selection cursor.
若要将选定内容复制到图像中的当前位置，请在选定内容光标外部单击。
To copy the selection into the image at its current location, click outside the selection cursor.
若要将选定内容复制到图像中的当前位置，请在选定内容光标外部单击。
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