<TextBox Grid.Row="1" Grid.RowSpan="3" Grid.Column="1" Grid.ColumnSpan="2" /> in VB.NET

Print QR-Code in VB.NET <TextBox Grid.Row="1" Grid.RowSpan="3" Grid.Column="1" Grid.ColumnSpan="2" />

<TextBox Grid.Row="1" Grid.RowSpan="3" Grid.Column="1" Grid.ColumnSpan="2" />
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The ColumnSpan and RowSpan properties are easy to add to any piece of content in a Grid. Occasionally, though, allowing content to span multiple cells isn t desirable, but you may need more space for content. Let s look at the Grid s sizing options.
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The Grid
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Sizing it up
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The overall dimensions of a Grid can be set to a specific number of pixels using the Height and Width properties. These dimensions are set like almost every other element in Silverlight. Defining the dimensions of a row or column within a Grid is an entirely different story because the Height of a RowDefinition and Width of a ColumnDefinition are represented as GridLength values. The System.Windows.GridLength type provides three different ways to specify how to allocate space. We ll discuss each of these options throughout this section. It s important to understand how each approach works because these options can be intertwined within the same Grid. Based on this fact, we ll naturally cover the typical pixel approach to sizing. In addition, we ll also cover the more dynamic auto-sizing approach. But first, we ll cover the default option used for sizing rows and columns: star sizing.
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STAR SIZING
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Star sizing enables you to equally distribute the available area of a Grid across its rows and columns. This is the default approach used within a Grid. But, if any row or column in a grid uses some other form of sizing, the other approach will take precedence. (It may be more appropriate to say that star sizing is used by the remaining available area.) Listing 7.7 illustrates this concept.
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Listing 7.7 Absolute and star sizing
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Result:
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XAML:
<Grid x:Name="myGrid" ShowGridLines="True" Background="LightGray" Width="200" Height="200"> <Grid.RowDefinitions> <RowDefinition Height="50" /> <RowDefinition Height="2*" /> Star <RowDefinition Height="3*" /> sizing </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="50" /> <ColumnDefinition Width="2*" /> <ColumnDefinition Width="3*" /> </Grid.ColumnDefinitions> </Grid>
Absolute sizing
Listing 7.7 shows a Grid using star sizing in addition to absolute sizing. Absolute sizing will be discussed in just a moment; for now, observe the values with the n* in them, for example the Height and Width values for the second and third rows and columns. This asterisk signals that the element will use star sizing with a multiplier. Although
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Panels
this example only uses integer values, you can use any positive double-precision value. This value specifies the proportion of the remaining space to allocate to the element. Star sizing works by determining how much space is available after the other sizing schemes have rendered. These calculations will return a remaining amount of available space. This space is divided proportionally across all the items using star sizing. As you can see, this approach provides an easy way to provide a proportionate-looking interface. Occasionally, you may want the size of the cells to be automatically determined based on their content. For these situations, it s appropriate to use the Auto GridLength option.
AUTO SIZING
The Auto GridLength option automatically determines how large or small to make an element, as shown in listing 7.8. With this option, the element s size is based primarily on the content that occupies it, but other factors can also dictate the size of an element using the Auto approach.
Listing 7.8 Auto sizing
Result:
XAML:
<Grid x:Name="myGrid" Height="100" Width="300" ShowGridLines="True" Background="LightGray"> Auto <Grid.ColumnDefinitions> sizing <ColumnDefinition Width="Auto" /> <ColumnDefinition Width="Auto" /> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition Height="Auto" /> <RowDefinition Height="Auto" /> </Grid.RowDefinitions> <TextBlock Text="Hello there, how are you " /> <TextBlock Text="I'm fine thanks!" Grid.Column="1" /> <TextBlock Text="That's Great" Grid.Row="1" /> </Grid>
Listing 7.8 uses the Auto sizing approach for the Grid s columns and rows. The result produced from this XAML shows two key aspects of Auto sizing. First, if a row or column uses Auto sizing, the size of the largest element in the row or column determines the size of the others. Second, any remaining space is allocated to the last row or column this is why the cells in the last row look so bloated. If you want to have complete control over the size of your cells, you need to use a more exact approach.
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