I have added CurrentCellChanged event in my application
this.dgMain.CurrentCellChanged += new EventHandler(dgMain_CurrentCellChanged);
event handler is as below
private void dgMain_CurrentCellChanged(object sender, EventArgs e)
{
}
Now in event handler how I will get current cell clicked.
Thanks in advance :):)
There are lots of ways but without knowing about your data, the only ones that come to mind is:
dgMain.CurrentColumn.GetCellContent
or
dgMain.SelectedItem
Related
Why does the DataGrid not always fire the MouseLeftButtonUp event?
I try to implement a single click behaviour on DataGridTextColumn and bind to this event.
dataGrid.MouseLeftButtonUp += OnDataGridMouseLeftButtonUp;
In the handler I call BeginEdit() and set focus on the TextBox element. It works when I get the event, but it is not always fired? Does anyone know how to fix that?
Thanks!
Try using AddHandler instead.
dataGrid.AddHandler(UIElement.MouseLeftButtonUpEvent,
new MouseButtonEventHandler(OnMouseLeftButtonUp), true)
...
private void OnMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
// etc...
}
Is there a way to create global keys in Silverlight? I added a KeyDown event handler to the topmost Page element. I can catch the key signal when elements like a Button, TextBox, Calendar, and RichTextBox have focus. But the DatePicker won't let me handle the key down event at the Page level. Any way to make a hotkey in non-OOB SL?
P.S. I am assuming that the DatePicker control behaves differently than others as it is still in the Silverlight Toolkit.
have you tried using the AddHandler method? With this method you can add a handler and define if you want to handle already handled events, too.
In my simple example I added it to the RootVisual in the app.xaml.cs.
private void Application_Startup(object sender, StartupEventArgs e)
{
this.RootVisual = new MainPage();
RootVisual.AddHandler(UIElement.KeyDownEvent, new KeyEventHandler(HandleKeyDown), true);
}
private void HandleKeyDown(object sender, KeyEventArgs e)
{
//Add your keyhandling code here
Debug.WriteLine(e.Key);
}
I tried it with a DatePicker and it works.
Hope this helps!
BR,
TJ
This may help you. The author provides two ways using HTML bridge (when your Silverlight does not have focus) and using the KeyUp event on Application.RootVisual.
I have not tried it myself so I wouldn't know if it's working.
I'm building a Windows Presentation Foundation control with Microsoft Blend.
When I leave my control by pressing the left-mouse-button, the MouseLeave-Event is not raised. Why not?
This is intended behaviour: When you are doing mousedown on a control and leaving the control, the control STILL retains its "capture" on the mouse, meaning the control won't fire the MouseLeave-Event. The Mouse-Leave Event instead will be fired, once the Mousebutton is released outside of the control.
To avoid this, you can simple tell your control NOT to capture the mouse at all:
private void ControlMouseDown(System.Object sender, System.Windows.Forms.MouseEventArgs e)
{
Control control = (Control) sender;
control.Capture = false; //release capture.
}
Now the MouseLeave Event will be fired even when moving out while a button is pressed.
If you need the Capture INSIDE the Control, you need to put in more effort:
Start tracking the mouseposition manually, when the mousekey is pressed
Compare the position with the Top, Left and Size Attributes of the control in question.
Decide whether you need to stop the control capturing your mouse or not.
public partial class Form1 : Form
{
private Point point;
private Boolean myCapture = false;
public Form1()
{
InitializeComponent();
}
private void button1_MouseDown(object sender, MouseEventArgs e)
{
myCapture = true;
}
private void button1_MouseMove(object sender, MouseEventArgs e)
{
if (myCapture)
{
point = Cursor.Position;
if (!(point.X > button1.Left && point.X < button1.Left + button1.Size.Width && point.Y > button1.Top && point.Y < button1.Top + button1.Size.Height))
{
button1.Capture = false; //this will release the capture and trigger the MouseLeave event immediately.
myCapture = false;
}
}
}
private void button1_MouseLeave(object sender, EventArgs e)
{
MessageBox.Show("Mouse leaving");
}
}
of course you need to stop the own tracking ( myCapture=false;) on MouseUp. Forgot that one :)
When I don't get mouse events I expect I typically use Snoop to help me understand what is happening.
Here are a couple of links:
1- Snoop (a WPF utility)
2- CodePlex project for Snoop
And for completeness and historical reasons (not the bounty - it doesn't make sense having two duplicate questions - you should probably move it into one if not too late)...
I made a thorough solution using global mouse hook here (approach 2)
WPF: mouse leave event doesn't trigger with mouse down
And simplified its use - you can use it by binding to commands in your view-model - e.g.
my:Hooks.EnterCommand="{Binding EnterCommand}"
my:Hooks.LeaveCommand="{Binding LeaveCommand}"
my:Hooks.MouseMoveCommand="{Binding MoveCommand}"
...more details in there
Old question but I came across the same problem with a Button (MouseLeave does not fire while MouseDown because MouseDown Captures the Mouse...)
This is how I solved it anyway:
element.GotMouseCapture += element_MouseCaptured;
static void element_MouseCaptured(object sender, MouseEventArgs e)
{
FrameworkElement element = (FrameworkElement)sender;
element.ReleaseMouseCapture();
}
Hope that helps someone looking for a quick fix :P
I have a WPF form with 3 buttons and have routed events on them, commands are binded on start...
private void InitCommandBinding(UIElement frameworkElement) {
CommandBinding commandBinding;
commandBinding = new CommandBinding(ViewModelCommands.Save, Save_Executed, Save_CanExecute);
frameworkElement.CommandBindings.Add(commandBinding);
commandBinding = new CommandBinding(ViewModelCommands.SaveAndClose, SaveAndClose_Executed, SaveAndClose_CanExecute);
frameworkElement.CommandBindings.Add(commandBinding);
commandBinding = new CommandBinding(ViewModelCommands.Delete, Delete_Executed, Delete_CanExecute);
frameworkElement.CommandBindings.Add(commandBinding);
}
the details ui has code like
private void Delete_Executed(object sender, ExecutedRoutedEventArgs e) {
try
{do validations }
}
private void Delete_CanExecute(object sender, CanExecuteRoutedEventArgs e) {
e.CanExecute = viewModel.IsValid(); (returns bool)
}
Validity enables and disables buttons etc.
The form has an instance of an object new or old and validations take place on the data
My issue is that the event just excute all the time and the form just hangs cause validation code does poll db etc to check....
how to I just get them to fire once when the form is loaded mmm....
If I understand you well it is only necessary to check the validity of the data at form load and the IsValid method is resource intensive?
Why don't you change the IsValid() method to an IsValid property and set this is in the Form_Loaded event?
The CanExute method will be checked any time the UI fires an event like TextChanged, LostFocus etc. So you better make such methods very lightweight.
I am trying to create a custom scrollbar and am using images as button.
For now a simple
I can handle the MouseLeftButtonDown and Up event just fine but what I'd like to do is while its held down, every so many millisecond trigger an event is fired.
I tried something like this but it isn't quite working. Suggestions?
public delegate void Changed(RangeScrollButtonControl sender, int value);
public event Changed OnChanged;
private System.Threading.Timer Timer;
private void Image_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
this.Timer = new System.Threading.Timer(Timer_Callback, null, 0, 100);
}
private void Image_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
this.Timer = null;
}
private void Timer_Callback(object sender)
{
if (this.OnChanged != null)
{
this.OnChanged(this, 1);
}
}
The piece of functionality you're looking for is a RepeatButton, this will fire it's Click event repeatedly while the mouse button is held down. You can configure the delay and the interval of the events.
You could then style this button to use the image at Silverlight Show
Hope this helps.
Which piece "isn't quite working" ?
Also, could you restyle or retemplate Silverlght's scrollbar similar to what is seen in this blog post to get what you need?
I would use a Storyboard as a timer. Something like:
Then you can do a MouseSTB.Begin. Once the Storyboard is finished you can catch it in the MouseSTB.Completeed Event. In that event you can do what ever you need to do and then just start it over again. It can easilly be controled by setting some flags on the mouseover, mouseenter and mouseleave events. I use these timers in a lot of place and they work just fine and they do not peg the processor.