WPF Discussion Boards

26-Jun-13 11:31

I have a WPF project and I have added a user control but when I try to add the xmlns of the user control to the MainWindow xaml, nothing shows up in the intellisense what am I missing here. Thanks.

tomr126-Jun-13 17:48

26-Jun-13 17:48

I think I found a solution to this. I just selected the first namespace that had the same name as my project. My project name is ParametricModeler. So I typed:

xmlns:local=""

and selected the option ParametricModeler(ParametricModeler). So that I have

xmlns:local="clr-namespace:ParametricModeler"

That let me add the user control I made to the MainWindow.

<Grid>
    ...
    <local:Calculator/>
</Grid>

I was working from a youtube video: [^]
But this is not the way xmlns namespace was selected in the example video. The name of the UserControl was added to the namespace options list after the project was rebuilt. But I could not get that option and I tried several times with different projects. He was using a different version of Visual Studio would that mater? Did I do good? I am using VS 2012.

Also how do you add a property to a user control if you are coding in Visual Basic?

Abhinav S26-Jun-13 18:31

Abhinav S

26-Jun-13 18:31

tomr1 wrote:
xmlns:local="clr-namespace:ParametricModeler"

You need to add a local reference to your class / dll.
So this is indeed correct.

Apps - Color Analyzer | Arctic | XKCD | Sound Meter | Speed Dial

tomr127-Jun-13 8:20

27-Jun-13 8:20

Thanks Abhinav S. I have a kind of related question about how to get access to the MainWindow resources from the UserControl. I have the MainWindow code:

HTML

<Window 
            xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:ParametricModeler"
...>

<Window.Resources>
...
</Window.Resources>

</Window>

Then in the UserControl I do not know how to access those resources. For instance I have a Gradient Brush that I am trying to apply to the control but its key is not recognized:

HTML

<UserControl x:Class="Calculator"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
          xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
...>
<Grid x:Name="CalculatorControl">
    
<Rectangle Fill="{StaticResource ButtonBrush}" RadiusX="10" RadiusY="10"/>
...
</Grid>
</UserControl>

The error reads, "The resource "ButtonBrush" could not be resolved".

windowmediasdk for silverlight

Meshack Musundi3-Jul-13 1:02

Meshack Musundi

3-Jul-13 1:02

The reason the UserControl can't access the gradient brush is because it's a Window resource. If it was a userControl resource, <UserControl.Resources>, then you wouldn't be getting the error. Alternatively you could place the gradient brush in a ResourceDictionary.

"As beings of finite lifespan, our contributions to the sum of human knowledge is one of the greatest endeavors we can undertake and one of the defining characteristics of humanity itself"

brodcasting26-Jun-13 0:24

brodcasting

26-Jun-13 0:24

i am looking for windowmedia format sdk that works with silverlight.

Draging Grids in WPF

tomr125-Jun-13 16:06

25-Jun-13 16:06

I have a WPF project where I have a main grid and inside that I have some basic 3D elements for basic 3D modeling of points in time(like a 3D grapher). I am using a seperate library for the 3D stuff. I added basic tools like a calculator and a timer control and other controls. These controls consist of a grid and inside that grid is a rectangle control and some textboxes and buttons. I do not know how to make the grids be dragable like a regular window. Is there a simple method for this?

I am using Visual Studio Express Edition 2012. I program in Visual Basic. Thanks for your help.

modified 25-Jun-13 23:51pm.

sorawit amorn27-Jun-13 11:25

sorawit amorn

27-Jun-13 11:25

Canvas would allow your costume grid to be drag-able.
To add Grid on to Canvas :

var canvas = new Canvas();
var grid = new YourCustomeGrid();
canvas.Children.Add(grid);

To set grid position on the canvas :

grid.SetValue(Canvas.TopProperty, 20.0);
grid.SetValue(Canvas.LeftProperty, 20.0);

Then you just have to Add Eventhandler for your control to change the position when your drag your mouse.

tomr11-Jul-13 15:44

1-Jul-13 15:44

Thanks for the reply sorawit amorn. Sorry about the delay.

So I made a new project to focus on just this dragging issue. I am not great with C# but I get most of what you have there. I declared a canvas and a grid inside that canvas in the xaml code of the main window. In the behind VB code I created a loaded event handler with the initial grid positions.

Here is the Main Window code:

HTML

<Window x:Class="MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Canvas x:Name="ControlCanvas" Background="AliceBlue" >
            <Grid x:Name="ControlGrid" Width="100" Height="40">
                <Rectangle Fill="Black"/>
            </Grid>
        </Canvas>
        
    </Grid>
</Window>

And here is the MainWindow.xaml.vb code:

Class MainWindow 

    Private Sub MainWindow_Loaded(sender As Object, e As RoutedEventArgs) Handles Me.Loaded
        ControlGrid.SetValue(Canvas.TopProperty, 20.0)
        ControlGrid.SetValue(Canvas.LeftProperty, 20.0)
    End Sub

    Private Sub MainWindow_MouseLeftButtonDown(sender As Object, e As MouseButtonEventArgs) Handles Me.MouseLeftButtonDown
        'What do I need to do next?
    End Sub
End Class

I have no idea how to write in code what I need to do next. I need a conditional statement for when the mouse is over the grid control. Then I need to get the position of the cursor and somehow update the position of the control simultaneously. How do I do that? Thanks again.

sorawit amorn3-Jul-13 5:32

sorawit amorn

3-Jul-13 5:32

you will have the object to hold your grid references when you click on and the you can define MouseMove event of you canvas to set new position every time the event trigger.

I don't remember VB syntax, but on c#, It will be ...

Code

 Grid mygrid;

 private MouseButtonEvent MouseLeftButtonDown(Object sender, MouseButtonEventArgs e){
    grid = sender as Grid;
    if(grid!= null){
          mygrid = grid;
    }
}

private MouseEventHandler MoveChildObject(Object sender, MouseEventHandler e){
    if(mygrid != null){
        Point p = Mouse.GetPosition(canvas);
        ControlGrid.SetValue(Canvas.TopProperty, p.Y);
        ControlGrid.SetValue(Canvas.LeftProperty, p.X);
    }
 }

private MouseButtonEvent mouseLeave(Object sender, MouseButtonEventArgs e){
     mygrid = null;
}

XMAL

XML

<Window x:Class="MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Canvas x:Name="ControlCanvas" Background="AliceBlue" MouseOver="MoveChildObject" >
            <Grid x:Name="ControlGrid" Width="100" Height="40" MouseLeftButtonUp="mouseLeave" MouseLeftButtonDown="MouseLeftButtonDown" >
                <Rectangle Fill="Black"/>
            </Grid>
        </Canvas>
        
    </Grid>
</Window>

NOTE :: you do not need to use grid, if you just use it for holding the rectangle. Just use rectangle object