I have a small WPF control that has a TextBlock with TextWrapping set to Wrap. I am trying to host this in an existing WinForms application. I have the ElementHost docked to the top of the form, and I would like to size the height of the ElementHost based on the height that the TextBlock require. Is there any way to accomplish this?
The resizing mechanism of WinForms is different from WPF's.
Have you tried setting the AutoSize property of the ElementHost to true?
I found the answer here
this is code from the link above:
public System.Windows.Size GetElementPixelSize(UIElement element)
{
Matrix transformToDevice;
var source = PresentationSource.FromVisual(element);
if (source != null)
transformToDevice = source.CompositionTarget.TransformToDevice;
else
using (var Hwndsource = new HwndSource(new HwndSourceParameters()))
transformToDevice = Hwndsource.CompositionTarget.TransformToDevice;
if (element.DesiredSize == new System.Windows.Size())
element.Measure(new System.Windows.Size(double.PositiveInfinity, double.PositiveInfinity));
return (System.Windows.Size)transformToDevice.Transform((Vector)element.DesiredSize);
}
Related
I want to set my StackPanel Orientation property to vertical in code behind. I cant find Enum that I can set Vertical.
var panel = new StackPanel();
panel.Orientation = Vertical;
After some research I found from MSDN
var panel = new StackPanel();
panel.Orientation = Orientation.Vertical;
May be helpful for researchers
I'm trying to take a screenshot of a datagrid which has to many rows to be displayed. So there is a scrollviewer.
So when I just put the datagrid into the Render Method of RenderTargetBitmap I obviously just get the viewable part of the datagrid.
I read that one can take a screenshot of a content when actually rendering the ItemsPresenter of the ScrollViewer of that control, as the ItemsPresenter would have the "real" Width and Height of the content.
Unfortunatly my ScrollViewer doesnt have any different Height, ActualHeight or RenderSize.Height than the dataGrid.
So I always just get the visible part of the Content.
Anyone know how to do this the right way, that it actually takes the whole content ?
Code:
var scroll = GetTemplateChildByName(dataGridInOut);
if (scroll != null)
{
var item = scroll.Content as ItemsPresenter;
var width = item.RenderSize.Width;
var height = item.RenderSize.Height;
var rtb = new RenderTargetBitmap((int) Math.Round(width), (int)Math.Round(height), 96, 96,
PixelFormats.Pbgra32);
var drawingVisual = new DrawingVisual();
var visualBrush = new VisualBrush(item);
using (var context = drawingVisual.RenderOpen())
{
context.DrawRectangle(visualBrush, null, new Rect(new Point(0,0), new Size(width, height)));
}
rtb.Render(drawingVisual);
Clipboard.SetImage(rtb);
}
Leaf is right. You could instantiate another DataGrid bound to the same source programmatically, put it into a container which gives it infinite space, wait for it to render and then take a screenshot of this. No need to actually show it in the UI.
I'm trying to create an overlay in wpf (with darkening background), similar to the ones you can find on the web to popup images.
I would like it to be reusable in more than 1 part of the application, with diffent types of content.
this is the temporary code of the constructor of the adorner class (just to try)
private readonly Grid _grid = new Grid();
public DarkOverlayAdorner(UIElement adornedElement, Object content) :
base(adornedElement)
{
_grid.Background = new SolidColorBrush(Color.FromArgb(99, 0, 0, 0));
IsHitTestVisible = true;
var visual = content as UIElement;
if (visual != null)
_grid.Children.Add(visual);
}
In addition in the class (of course), I have the ovverrides of MeasureOverride and ArrangeOverride to give the adorner the correct size of the adorned element, GetVisualChild, and VisualChildCount...
The problem here is that the adorner is correctly shown, but no events or behaviour are applied on the adorned element. For example:
AdornerLayer layer = AdornerLayer.GetAdornerLayer(textBoxProva);
layer.Add(new DarkOverlayAdorner(textBoxProva, new Button{Content = "prova"}));
The button here is shown, but I can-t click the button and no effects on button mouseover are applied.
I still can't figure out the problem.
Ok, I've lost a lot of time trying to figure out what was the problem.
In the end I found the solution:
If you want the element added to react to events, I think that the element must be bound to the visual tree of the adorner.
The way to do it is to use a VisualCollection, intitialized to the adorner itself:
VisualCollection visualChildren;
FrameworkElement #object;
public DarkOverlayAdorner(UIElement adornedElement) :
base(adornedElement)
{
visualChildren = new VisualCollection(this);
#object = new Button {Content = "prova"};
visualChildren.Add(#object);
}
protected override Visual GetVisualChild(int index)
{
return visualChildren[index];
}
This way the events are correctly routed.
You might want to take a look at the ChildWindow control in the Extended WPF Toolkit. It is a control that pops up a Window with a modal background effect, and you can specify the content to put inside the Window.
I'm using WPF in WinForms with ElementHost. When the form loads, there is a flash of black background where the ElementHost is about to load. This looks kind of bad. Any suggestions on how to get rid of this?
Hide the element (Visibility = Hidden) until the WinForms control is fully loaded...
I know this has already been answered and the question is old but none of the presented answers worked for myself and after a long time of troubleshooting the issue. I finally found an easier answer.
If you build a class extending from Element Host and in the initial constructor. You can set a Load Event for the Host Container. The Host Container is the panel that the Element Hosts Child is being displayed on top of. From there, just set the Host Containers background color to being of the Element Hosts Parents background color.
Like this
using System.Windows;
using System.Windows.Forms;
using System.Windows.Media;
public class MyElementHost : ElementHost
{
public MyElementHost()
{
this.HostContainer.Loaded += new RoutedEventHandler(HostPanelLoad);
}
public void HostPanelLoad(object sender, RoutedEventArgs e)
{
System.Drawing.Color parentColor = this.Parent.BackColor;
this.HostContainer.Background = new SolidColorBrush(Color.FromArgb(parentColor.A, parentColor.R, parentColor.G, parentColor.B));
}
}
you need first show control with empty bounds first time to avoid black flickering
if (!_control.Created && _control.BackColor != Color.Transparent)
{
_control.Bounds = Rectangle.Empty;
_control.Show();
}
// set control bounds and show it
Rectangle bounds = GetBounds(context, rect);
if (_control.Bounds != bounds)
_control.Bounds = bounds;
if (!_control.Visible)
_control.Show();
How do I implement a tab control with vertical tabs in C#?
Create an instance of System.Windows.Forms.TabControl (one of the standard container controls for Windows Forms) and set the Alignment property to Left.
First set in properties the Alignment property to Left.
Second set SizeMode property to Fixe.
Third set ItemSize property to prefered size example width :30 height :120.
After that you need to set the DrawMode property to OwnerDrawFixed.
Next step is define a handler for the DrawItem event of TabControl that renders the text from left to right.
Example
In form Designers.cs file
TabControl.DrawItem += new DrawItemEventHandler(tabControl_DrawItem);
Definition for tabControl_DrawItem method:
private void tabControl_DrawItem(Object sender, System.Windows.Forms.DrawItemEventArgs e)
{
Graphics g = e.Graphics;
Brush _textBrush;
// Get the item from the collection.
TabPage _tabPage = TabControl.TabPages[e.Index];
// Get the real bounds for the tab rectangle.
Rectangle _tabBounds = TabControl.GetTabRect(e.Index);
_textBrush = new System.Drawing.SolidBrush(Color.Black);
// Use our own font.
Font _tabFont = new Font("Arial", (float)12.0, FontStyle.Bold, GraphicsUnit.Pixel);
// Draw string. Center the text.
StringFormat _stringFlags = new StringFormat();
_stringFlags.Alignment = StringAlignment.Center;
_stringFlags.LineAlignment = StringAlignment.Center;
g.DrawString(_tabPage.Text, _tabFont, _textBrush, _tabBounds, new StringFormat(_stringFlags));
}
Effect:Ready horizontal tabcontrol
I was based on https://msdn.microsoft.com/en-us/library/ms404305(v=vs.110).aspx