I write certain code in my form ResizeEnd event. Now problem is when form is moved by clicking and dragging on the caption bar, ResizeEnd event is fired and code is executed even though form size is NOT changed.
I gone through MSDN documentation for Resizeend event and it says that event will fire when form is moved (don't understand why this happens when the size is NOT changed).
For resolution I put the if condition to check if size is changed like below to stop execution of code on form move:
int Prv_Height; int Prv_Width;
private void TemplateGrid_ResizeEnd(object sender, EventArgs e)
{
if (this.Size.Width != Prv_Width || this.Size.Height != Prv_Height)
{
Prv_Width = this.Size.Width;
Prv_Height = this.Size.Height;
//Other code here when form resize ends...
}
}
So is there any way to stop ResizeEnd event to fire when form is moved? or any other better approach to solve the problem?
You could move your check for sizechange to a new baseform. On derived forms the resizeEnd event will then only fire if the size is actually changed.
public partial class CustomForm : Form
{
private Size _prvSize;
public CustomForm()
{
InitializeComponent();
}
protected override void OnShown(EventArgs e)
{
_prvSize = this.Size;
base.OnShown(e);
}
protected override void OnResizeEnd(EventArgs e)
{
if (this.Size == _prvSize)
return;
_prvSize = this.Size;
base.OnResizeEnd(e);
}
}
private void Form1_ResizeBegin(object sender, EventArgs e)
{
oldSize = ClientSize;
}
private Size oldSize = new Size();
private void Form1_ResizeEnd(object sender, EventArgs e)
{
if (oldSize == ClientSize)
return;
//Add Something
}
Related
I have a TextChanged event attached to a TextBox in a Windows Form. How to make sure if a particular call to that event wasn't triggered programmatically rather by user interacting with the TextBox?
I would like to extend #rw_'s solution a little. Inside your TextBox event handler,
private void txt_TextChanged(object sender, EventArgs e)
{
if (!(sender is null) &&((TextBox)sender).ContainsFocus)
{
//Code if triggered by Click event
}
else
{
//Code if triggered programmatically
}
}
This will help your program adjust to the case where sender object is not null for some reason.
I am unsure about what your question means. I'll split my answer.
If you want to call the text changed function programmatically and differ when it was called by user interactivity or if it was called programmatically:
Assuming that when you call the function programmatically you pass null on sender and event args txt_TextChanged(null,null);, you could use this solution:
private void txt_TextChanged(object sender, EventArgs e)
{
if(sender == null)
{
// triggered programmatically
}
else
{
// triggered by the user. sender object is the textbox interacted by the user
}
}
If you want to change the text programmatically without triggering the event:
this.txt.TextChanged -= new System.EventHandler(this.txt_TextChanged);
txt.Text = "bar";
this.txt.TextChanged += new System.EventHandler(this.txt_TextChanged);
This is a common problem. You can set a flag on your form before updating the value and then check it in your event handler:
handleEvent = false;
TextBox1.Text = "foo";
handleEvent = true;
Then in your handler, check the flag:
private void TextBox1_TextChanged(object sender, EventArgs e)
{
if(handleEvent)
{
// do stuff
}
}
I need to know if there is a way to access to the events of the buttons inside a RepositoryItemTimeSpanEdit.
Image to see the buttons I need the events for: Click
Image
I have tried to access in the PopUp event and QueryPopUp, however I can't get the button in any way yet.
You can get this form through Form.OwnedForms property in Popup event. The type of this form is DevExpress.XtraEditors.Popup.TimeSpanEditDropDownForm, so you need just to find the form of this type. After that you can access buttons by using TimeSpanEditDropDownForm.OkButton property and TimeSpanEditDropDownForm.CloseButton property.
Here is example:
private void repositoryItemTimeSpanEdit1_Popup(object sender, EventArgs e)
{
var popupForm = (TimeSpanEditDropDownForm)OwnedForms.FirstOrDefault(item => item is TimeSpanEditDropDownForm);
if (popupForm == null)
return;
popupForm.OkButton.Click += OkButton_Click;
popupForm.CloseButton.Click += CloseButton_Click;
}
private void OkButton_Click(object sender, EventArgs e)
{
MessageBox.Show("Ok");
}
private void CloseButton_Click(object sender, EventArgs e)
{
MessageBox.Show("Cancel");
}
OK, so I have a window called PictureWindow which displays pictures (I've cut out the code not related to making tabs). The TabControl is named "itemsTab". Using a button press, I can make a new tab no problem. But using the same operations inside a called method doesn't work. Using the buttonTab_Click method makes a new tab, the newTab method does not.
The only real difference I can see is due to the sender and RoutedEventArgs objects - how do these effect the operation here? Or is there something else I'm missing?
Thanks in advance.
Edit To make things even stranger, the newTab method does make a new tab, but only if it is called in the PictureWindow constructor method. If I have the following a new tab is made.
public PictureWindow(string current)
{
InitializeComponent();
newTab(current);
}
But if I call the method anywhere else it doesn't work.
public partial class PictureWindow : Window
{
public PictureWindow(string current)
{
InitializeComponent();
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
}
private void buttonClose_Click(object sender, RoutedEventArgs e)
{
this.Close();
}
private void buttonTab_Click(object sender, RoutedEventArgs e)
{
TabItem newTab = new TabItem();
newTab.Header = "New Tab!";
itemsTab.Items.Add(newTab);
}
public void newTab(string current)
{
TabItem newTab = new TabItem();
itemsTab.Items.Add(newTab);
}
}
i have a situation where : User moves mouse over the image .
If user keeps mouse on that image for specific time ex. 2 seconds then only i have to proceed
further in mouseenter event otherwise don't.
I have already refred to http://forums.silverlight.net/t/86671.aspx/1 but looks like mine is different case.
One option is to use a DispatchTimer to determine the length of the mouse over.
bool isMouseOverImage = false;
public void Image_MouseEnter(object sender, MouseEventArgs e)
{
this.isMouseOverImage = true;
var timer = new System.Windows.Threading.DispatcherTimer();
timer.Interval = TimeSpan.FromSeconds(2);
timer.Tick += (object timerSender, EventArgs timerArgs) =>
{
if(this.isMouseOverImage)
{
// write your code
}
// stop the timer
timer.Stop();
};
timer.Start();
}
public void Image_MouseLeave(object sender, MouseEventArgs e)
{
this.isMouseOverImage = false;
}
If you have multiple images, you should create a re-usable Behavior and attach it to each image. I can define code for that if that would help.
I have to handle both the single click and the double click of a button in a WPF application with different reaction.
Unfortunately, on a doubleclick, WPF fires two click event and a double click event, so it's hard to handle this situation.
It tried to solve it using a timer but without success...I hope you can help me.
Lets see the code:
private void delayedBtnClick(object statInfo)
{
if (doubleClickTimer != null)
doubleClickTimer.Dispose();
doubleClickTimer = null;
this.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Normal, new VoidDelegate(delegate()
{
// ... DO THE SINGLE CLICK ACTION
}));
}
private void btn_Click(object sender, RoutedEventArgs e)
{
if (doubleClickTimer == null)
doubleClickTimer = new Timer(delayedBtnClick, null, System.Windows.Forms.SystemInformation.DoubleClickTime, Timeout.Infinite);
}
}
}
private void btnNext_MouseDoubleClick(object sender, MouseButtonEventArgs e)
{
if (doubleClickTimer != null)
doubleClickTimer.Change(Timeout.Infinite, Timeout.Infinite); // disable it - I've tried it with and without this line
doubleClickTimer.Dispose();
doubleClickTimer = null;
//.... DO THE DOUBLE CLICK ACTION
}
The problem is that the 'SINGLE CLICK ACTION' called after the 'DOUBLE CLICK ACTION' on doubleclick. It's strange that I set thedoubleClickTimer to null on double click but in the delayedBtnClick it's true :O
I've already tried to use longer time, a bool flag and lock...
Do you have any ideas?
Best!
If you set the RoutedEvent's e.Handled to true after handling the MouseDoubleClick event then it will not call the Click Event the second time after the MouseDoubleClick.
There's a recent post which touches on having different behaviors for SingleClick and DoubleClick which may be useful.
However, if you are sure you want separate behaviors and want/need to block the first Click as well as the second Click, you can use the DispatcherTimer like you were.
private static DispatcherTimer myClickWaitTimer =
new DispatcherTimer(
new TimeSpan(0, 0, 0, 1),
DispatcherPriority.Background,
mouseWaitTimer_Tick,
Dispatcher.CurrentDispatcher);
private void Button_MouseDoubleClick(object sender, MouseButtonEventArgs e)
{
// Stop the timer from ticking.
myClickWaitTimer.Stop();
Trace.WriteLine("Double Click");
e.Handled = true;
}
private void Button_Click(object sender, RoutedEventArgs e)
{
myClickWaitTimer.Start();
}
private static void mouseWaitTimer_Tick(object sender, EventArgs e)
{
myClickWaitTimer.Stop();
// Handle Single Click Actions
Trace.WriteLine("Single Click");
}
You could try this:
Button.MouseLeftButtonDown += Button_MouseLeftButtonDown;
private void Button_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
e.Handled = true;
if (e.ClickCount > 1)
{
// Do double-click code
}
else
{
// Do single-click code
}
}
If neccessary, you could require mouse click and wait until mouse up to perform the action.