I am develovp my application in WPF, it is screen recording app. So when the user click on record menu, a window will open and recording the screen. I want to change the recording screen based on mouse pointer change. When the user start the record the window will close, and if the user move the pointer into a particular point in the window, need to show the record window options.
You could position a transparent control in the area where you want the mouse pointer to be in when the record options need to show.
Then use a data trigger to alter the visibility of the record options.
See below for an example which demonstrates this. Note that there is a 2-row grid into which the hover area and the recording area would be placed, but you can adapt this.
<Grid Name="GridMouseHover" Background="Transparent" Grid.Row="0" />
<Grid Background="Red" Grid.Row="1">
<Grid.Resources>
<Style TargetType="Grid">
<Style.Triggers>
<DataTrigger Binding="{Binding IsMouseOver, ElementName=GridMouseHover}" Value="True">
<Setter Property="Visibility" Value="Visible"/>
</DataTrigger>
<DataTrigger Binding="{Binding IsMouseOver, ElementName=GridMouseHover}" Value="False">
<Setter Property="Visibility" Value="Hidden"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Grid.Resources>
</Grid>
Related
I've searched quite a bit but most of the solutions I found were from people asking on how to do it in C#. I wanted both to practice my XAML and reduce my already messy C# code so I decided to try it on XAML.
What I've Tried:
I've created a template for the Context Menu and here's my code:
<ControlTemplate TargetType="ContextMenu">
<Grid>
<!-- Some Content -->
</Grid>
<ControlTemplate.Triggers>
<DataTrigger Binding="{Binding Parent.IsMouseOver, RelativeSource={RelativeSource TemplatedParent}}" Value="True">
<Setter Property="IsOpen" Value="True"/>
</DataTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
My understanding of the code:
I imagined the hierarchy to be like this:
Parent UIControl (Can be a button, textbox, etc)
|---> Context Menu
|---> Template
So with my code Binding Parent.IsMouseOver, RelativeSource={RelativeSource TemplatedParent}, I expected it to work like this:
I've set my source to the TemplatedParent first (which I expected to be the Context Menu)
Now I'm trying to bind to the Parent (which is a UIControl of whoever uses the Context Menu) of my source (which at the moment I expect to be the TemplatedParent)
Here's the full code of everything involved with this:
Parent:
<Button Content="Button" ContextMenu="{DynamicResource ErrorPopup}"/>
Context Menu w/ Control Template (They're stored on a ResourceDictionary since they'll be reused by other controls to display each of their own Errors):
-
<ContextMenu x:Key="ErrorPopup" x:Shared="False">
<ContextMenu.Style>
<Style TargetType="ContextMenu">
<Setter Property="IsOpen" Value="False"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ContextMenu">
<Grid>
<!-- Some Content -->
</Grid>
<ControlTemplate.Triggers>
<DataTrigger Binding="{Binding Parent.IsMouseOver, RelativeSource={RelativeSource TemplatedParent}}" Value="True">
<Setter Property="IsOpen" Value="True"/>
</DataTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ContextMenu.Style>
</ContextMenu>
What I expect:
I expected the Context Menu to popup when I place my cursor on top of the Button.
UPDATE:
I've managed to make some progress, I tried changing my binding to:
<DataTrigger Binding="{Binding IsMouseOver, RelativeSource={RelativeSource AncestorType=Button,Mode=FindAncestor}}" Value="True">
<Setter Property="IsOpen" Value="True"/>
</DataTrigger>
Unfortunately it's displaying some weird behavior wherein the MouseOver would show the context menu ONLY if I forcibly open a Context Menu beforehand by using my mouse's right click.
This doesn't work:
I hover over the Button
Context Menu doesn't show up
This works:
I right click the Button
Context Menu shows up
Closes quickly
Shows a Context Menu from the Mouse Over
I move the cursor away = Context Menu disappears
I move the cursor inside = Context Menu appears
Could this be because the context menu doesn't actually exist yet up until I explicitly open it through a mouse's right click? And after initializing it, only then will the triggers work?
I am trying to change the color of the mouse cursor when it's hovering over a textbox, so that it's easier to see on a dark background.
I know how to change four things:
Textbox background color (.Background)
Textbox foreground color (.Foreground)
Textbox caret color (.CaretBrush)
Mouse cursor image (Mouse.OverrideCursor or this.Cursor)
I just can't change the mouse cursor color.
I came across a way to completely change the mouse cursor to a custom made cursor in another question someone posted: "Custom cursor in WPF?". But it seems overkill for just wanting to change the color, so that I can actually see where the mouse is.
The mouse cursor color actually changes to white automatically if the textbox has a black background. But does not change automatically if it has a dark background that isn't quite black.
It's this simple. Try changing the CaretBrush color. See sample code below.
<TextBox Text="This is some random text" CaretBrush="Blue" />
EDIT :
You can't change the color of the mouse color without defining a custom cursor, but you can change it's type. See the example below.
<Grid>
<TextBox Width="70" Height="20" CaretBrush="IndianRed" Text="TEST">
<TextBox.Style>
<Style TargetType="TextBox">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Cursor" Value="Pen" />
</Trigger>
<Trigger Property="IsMouseOver" Value="False">
<Setter Property="Cursor" Value="Arrow" />
</Trigger>
</Style.Triggers>
</Style>
</TextBox.Style>
</TextBox>
</Grid>
If you want to change the cursor type see this post Custom cursor in WPF?
You can change colour of the cursor with using CaretBrush property at WPF.
For example:
<Style x:Key="TextBoxStyle" TargetType="TextBox">
<Style.Triggers>
<Trigger Property="IsKeyboardFocusWithin" Value="True">
<Setter Property="CaretBrush" Value="White"/>
</Trigger>
</Style.Triggers>
</Style>
You can add your own trigger conditions if you want.
Is code behind in WPF for UI related things really ugly?
I'm trying to achieve similar effect to Visual Studio Panels (something like sample in WPF Unleashed book).
I want to change Grid Visibility to Visible when mouse enter into the button "solutionManagerPanel". It works however when my mouse enter into this Grid, it's visibility changes to hidden.
Below is code in xaml:
<Grid Grid.Column="2" Background="Gray" Visibility="{Binding ElementName=solutionManagerPanel, Path=IsMouseOver, Converter={StaticResource BooleanToVisibilityConverter}}">
<Grid.Resources>
<Style TargetType="{x:Type Grid}">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Visibility" Value="Visible"/>
</Trigger>
</Style.Triggers>
</Style>
</Grid.Resources>
Is there any simple way to do this in XAML or can I write event handling code-behind for this? Wouldn't this violate "clean, MVVM code rules"?
I have a ribbon in my application with a contextual tab. I have managed to get the tab to show and hide itself correctly based on what is selected in my application. My question is, how would I get it to be automatically selected (i.e. brought to front) when it is shown?
I figured it out. Just needed to do a style trigger based on the visibility:
<r:RibbonTab Header="Options"
ContextualTabGroupHeader="Options"
Visibility="{Binding CurrentFiles.SelectedItem, Converter={StaticResource DSToVisConverter}}" >
<r:RibbonTab.Style>
<Style TargetType="r:RibbonTab">
<Style.Triggers>
<Trigger Property="Visibility" Value="Visible">
<Setter Property="IsSelected" Value="True" />
</Trigger>
</Style.Triggers>
</Style>
</r:RibbonTab.Style>
I am using Expander in WPF to display my data. The default style for the Expander control contains a toggle button which shows/hides my content when I click on it.
How can I modify the style so that it expands when I hovers the mouse over the header and collapse when I move away?
Barebone setup should be this:
<Style TargetType="{x:Type Expander}">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="IsExpanded" Value="True" />
</Trigger>
</Style.Triggers>
</Style>
(Applies to the whole expander, not just the header. That would probably require messing with the template.)
It is possible to use databinding between isExpanded property an ismouseover:
IsExpanded="{Binding IsMouseOver, Mode=OneWay, RelativeSource={RelativeSource Self}}"