In this section of the course, we’ll take a look at some of the extra things
you can do with VB.NET forms. First, we’ll take a look at the Anchor and Dock
properties of a form.
Anchoring and Docking
The Anchor and Dock properties of a form are two separate properties. Anchor
refers to the position a control has relative to the edges of the form. A
textbox, for example, that is anchored to the left edge of a form will stay
in the same position as the form is resized. Docking refers to how much space
you want the control to take up on the form. If you dock a control to the
left of the form, it will stretch itself to the height of the form, but its
width will stay the same. Let’s take a look at some examples, to clear things
Start a new windows projects. Add two textboxes to your form, and set the
MultiLine properties of both to True. Change the height of the boxes.
Click on Textbox1 and locate the Anchor property in the Properties box:
The default is to anchor the control to the Top, Left edge of
the form. Click the arrow to reveal a curious drop down box:
The button in the middle represents your control. The big white
areas are rather confusing – they don’t actually do anything! To change the
property, you click the smaller grey or white rectangles between the big white
rectangle. Click again to deselect it. In the image below, the property has
been changed so that the textbox is anchored to the Top, Left and Right sides
of the form:
The next image has the textbox anchored to the Right and Bottom
edges of the Form:
Notice where the cursor is in the images, and what has been
changed. Click the arrow on the drop down box to confirm your choices.
To see what effect this all has, do the following:
- Set the Anchor property of Textbox1 on the default of Top, Left
- Change the Anchor property of Textbox2 to None (all the small rectangles should be white.)
- Run your programme and drag the edges of the Form outward. This will resize your form
What you should notice is that Textbox1 stays where it is, and that the left
edge of Textbox2 moves.
Stop your programme from running. Change the Anchor properties of the two
textboxes to anything you like. Run your form again and watch what happens.
Try anchoring one textbox to the left and right of the form. Watch what happens.
But anchoring a control to an edge of the form is a useful property to get
used to, if you have a form that can be resized and want your controls to
stay where they are.
Docking is similar to Anchoring, but this time the control fills a certain
area of the form. To see how it works, click on one of your textboxes and
locate the Dock property. Click the arrow to reveal a drop down box:
This time, all the rectangles are like buttons. You can only
dock to one side at a time, and the default is None. Click a button to see
what it does to your textbox. Click the middle one, and the textbox will Fill
the whole form.
Docking is quite useful when used with the splitter control and panels, allowing
you to create a Windows-style interface.
In the next part, we’ll take a look at how to add a Toolbar to your Form.
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