print barcode vb.net Figure 15.2 A traditional explorer-style interface displaying photo albums. in Visual C#

Creator Data Matrix ECC200 in Visual C# Figure 15.2 A traditional explorer-style interface displaying photo albums.

Figure 15.2 A traditional explorer-style interface displaying photo albums.
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CREATING A TREE VIEW There is, in fact, an issue here with how a tree view and list view are arranged on the form. The gray vertical bar in the middle of our interface is a special control called a splitter to separate the two controls. We will talk about splitters in a moment. First, let s add a TreeView to our form and see what happens.
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Set the version number for the MyAlbumExplorer application to 15.2. CREATING A TREE VIEW CONTROL Action 1 In the MainForm.cs [Design] window, drag a TreeView control onto the form and set its properties.
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Settings Property (Name) Dock Value treeViewMain Left
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Result
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Bring the list view to the top of the z-order. How-to: Right-click the ListView control and select the Bring to Front option.
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Set the HideSelection property in both the ListView and the TreeView to false.
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Note: This will highlight the selected object in both controls even when these controls do not have the focus.
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TREE VIEWS
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So far, so good. We have a TreeView on the left and a ListView on the right. If you run this program, you will see the interface shown in figure 15.3. The tree control is on the left, and the list view on the right. We have not added any nodes to our tree yet, but the photo albums from the default album directory appear in the list view as was discussed in chapter 14. Note here that the ListView must be brought to the top of the z-order in step 2 to ensure it is not obscured by the TreeView control.
TRY IT!
Send the ListView control to the bottom of the z-order using the Send to Back menu item. Run the application to see what happens. Because the controls are placed on the form starting at the bottom of the z-order, the ListView in this case fills the entire client window. The TreeView is then docked to the left of the form. When the ListView is at the top, the TreeView is docked first, and then the ListView fills the remaining area.
You will note that if you resize the form in figure 15.3, the size of the tree view does not change. In addition, the line between the two controls cannot be dragged as is the case in other explorer-style programs such as Windows Explorer. We can enable this behavior by adding a Splitter control to our form. We will do this next, after which we will look at populating our tree with some items.
Figure 15.3 The ListView control here works as before, just within a smaller area.
USING THE SPLITTER CLASS As a short aside to our discussion on tree views, the Splitter class is useful for dividing all or part of a form or other container into two resizable sections. While some readers may not consider a splitter control to be an advanced concept, it fits nicely into our discussion of the MyAlbumExplorer application, so this is where it goes. Typically a splitter provides separate areas for two collection or container controls, normally one of the ListBox, ListView, TreeView, or Panel controls. An overview of the Splitter class is given in .NET Table 15.2. A splitter can appear horizontally or vertically. When docked to the top or bottom of a container, it is a horizontal splitter; when docked to the left or right, it is a vertical 489
THE TREEVIEW CLASS
splitter. We will create a vertical splitter in our MyAlbumExplorer application, and then discuss how to turn this into a horizontal splitter.
.NET Table 15.2 Splitter class
The Splitter class represents a control that divides a container into two sections. Each section contains a docked control, and the splitter permits the user to resize each section at runtime. This class is part of the System.Windows.Forms namespace, and inherits from the Control class. See .NET Table 4.1 on page 104 for a list of members inherited by this class. BorderStyle Cursor (overridden from Control) Dock (overridden from Control) Public Properties MinExtra Gets or sets the border style for the control. Gets or sets the cursor for the control. A horizontal splitter uses the HSplit cursor by default, while a vertical splitter uses the VSplit cursor by default. Gets or sets the docking style. A splitter must be docked to one side of its container. This setting determines the orientation, either vertical or horizontal, of the splitter. The None and Fill values are not permitted. The position of the splitter in the z-order determines the location of the splitter within its container. Gets or sets the minimum size for the remainder of the container, which is occupied by the subsequent control in the docking order. Gets or sets the minimum size for the target of the splitter, which is the previous control in the docking order. Gets or sets the position of the splitter, in pixels. Occurs when the splitter has moved. Occurs when the splitter is moving.
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