I have an mdiParent form in which i have a save method. Now I want that whenever i press Ctrl+S in my activeMdiChild form the parents Save method should get called. Any hint or suggestion is welcome.
Thanx in advance.
If you have a MenuStrip in the MDI Parent Form, then you don't need to do anything else than adding a menu with the Ctrl+S shortcut. Then if the user press those combination even in child form, the code for that menu of parent will execute.
But if you don't want to add a menu, then you can override ProcessCmdKey in the "MDI Parent Form" and check if the Ctrl+S combination was pressed, then perform the desired action:
protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
if (keyData == (Keys.Control | Keys.S))
{
MessageBox.Show("Handled in main form.");
return true;
}
return base.ProcessCmdKey(ref msg, keyData);
}
The
ProcessCmdKey
method overrides the base ContainerControl.ProcessCmdKey
implementation to provide additional handling of main menu command
keys and MDI accelerators.
Handle the KeyDown event in activeMdiChild .
private void activeMdiChild _KeyDown(object sender, KeyEventArgs e) {
if (e.KeyCode == Keys.S && e.Modifiers == Keys.Control)
{
dynamic parent = this.Parent;
parent.Save();
}
}
EDIT: as mentioned in comments, mdiParent.Save must be public
One of possible solutions:
1. Create an interface
ISave
{
void Save();
}
2. Let your parent form inherit interface
3. In your child form check for ctrl + s if so do
ISave saver = this.Parent as ISave;
if(saver != null)
saver.Save();
That's all
Related
I'm looking for a best way to implement common Windows keyboard shortcuts (for example Ctrl+F, Ctrl+N) in my Windows Forms application in C#.
The application has a main form which hosts many child forms (one at a time). When a user hits Ctrl+F, I'd like to show a custom search form. The search form would depend on the current open child form in the application.
I was thinking of using something like this in the ChildForm_KeyDown event:
if (e.KeyCode == Keys.F && Control.ModifierKeys == Keys.Control)
// Show search form
But this doesn't work. The event doesn't even fire when you press a key. What is the solution?
You probably forgot to set the form's KeyPreview property to True. Overriding the ProcessCmdKey() method is the generic solution:
protected override bool ProcessCmdKey(ref Message msg, Keys keyData) {
if (keyData == (Keys.Control | Keys.F)) {
MessageBox.Show("What the Ctrl+F?");
return true;
}
return base.ProcessCmdKey(ref msg, keyData);
}
On your Main form
Set KeyPreview to True
Add KeyDown event handler with the following code
private void MainForm_KeyDown(object sender, KeyEventArgs e)
{
if (e.Control && e.KeyCode == Keys.N)
{
SearchForm searchForm = new SearchForm();
searchForm.Show();
}
}
The best way is to use menu mnemonics, i.e. to have menu entries in your main form that get assigned the keyboard shortcut you want. Then everything else is handled internally and all you have to do is to implement the appropriate action that gets executed in the Click event handler of that menu entry.
You can even try this example:
public class MDIParent : System.Windows.Forms.Form
{
public bool NextTab()
{
// some code
}
public bool PreviousTab()
{
// some code
}
protected override bool ProcessCmdKey(ref Message message, Keys keys)
{
switch (keys)
{
case Keys.Control | Keys.Tab:
{
NextTab();
return true;
}
case Keys.Control | Keys.Shift | Keys.Tab:
{
PreviousTab();
return true;
}
}
return base.ProcessCmdKey(ref message, keys);
}
}
public class mySecondForm : System.Windows.Forms.Form
{
// some code...
}
If you have a menu then changing ShortcutKeys property of the ToolStripMenuItem should do the trick.
If not, you could create one and set its visible property to false.
From the main Form, you have to:
Be sure you set KeyPreview to true( TRUE by default)
Add MainForm_KeyDown(..) - by which you can set here any shortcuts you want.
Additionally,I have found this on google and I wanted to share this to those who are still searching for answers. (for global)
I think you have to be using user32.dll
protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
if (m.Msg == 0x0312)
{
/* Note that the three lines below are not needed if you only want to register one hotkey.
* The below lines are useful in case you want to register multiple keys, which you can use a switch with the id as argument, or if you want to know which key/modifier was pressed for some particular reason. */
Keys key = (Keys)(((int)m.LParam >> 16) & 0xFFFF); // The key of the hotkey that was pressed.
KeyModifier modifier = (KeyModifier)((int)m.LParam & 0xFFFF); // The modifier of the hotkey that was pressed.
int id = m.WParam.ToInt32(); // The id of the hotkey that was pressed.
MessageBox.Show("Hotkey has been pressed!");
// do something
}
}
Further read this http://www.fluxbytes.com/csharp/how-to-register-a-global-hotkey-for-your-application-in-c/
Hans's answer could be made a little easier for someone new to this, so here is my version.
You do not need to fool with KeyPreview, leave it set to false. To use the code below, just paste it below your form1_load and run with F5 to see it work:
protected override void OnKeyPress(KeyPressEventArgs ex)
{
string xo = ex.KeyChar.ToString();
if (xo == "q") //You pressed "q" key on the keyboard
{
Form2 f2 = new Form2();
f2.Show();
}
}
In WinForm, we can always get the Control Key status by:
bool IsCtrlPressed = (Control.ModifierKeys & Keys.Control) != 0;
The VB.NET version of Hans' answer.
(There's a ProcessCmdKey function template in Visual Studio.)
Protected Overrides Function ProcessCmdKey(ByRef msg As Message, keyData As Keys) As Boolean
If (keyData = (Keys.Control Or Keys.F)) Then
' call your sub here, like
SearchDialog()
Return True
End If
Return MyBase.ProcessCmdKey(msg, keyData)
End Function
End Class
I made a program in WinForms that shows a blank screen, and then if you press Enter then something happens..
well i used this code:
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
label1.Visible = false;
Colors.Start();
}
Now when I tried to add some buttons to the blank screen, the option to click on Enter just don't work anymore... no matter what I do. and please don't earse this question, I'm kind of new in programming and I know there's alot of questions like that one, but I couldn't understand them...
thanks
Is the form's AcceptButton property assigned to a button?
If so, that could be grabbing the Enter keystroke first.
An example of the suggestion by Hans Passant:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
if (keyData == Keys.Enter)
{
MessageBox.Show("Enter");
return true; // optionally prevent further action(s) on Enter; such as Button clicks
}
return base.ProcessCmdKey(ref msg, keyData);
}
}
Note that if you return true, then controls like the buttons will not get the Enter keystroke.
I need to have a Button on a UserControl (not Form) in a windows application to respond to "Enter" hit, the way a button which is set as the Accept Button of a Form works.
I cannot make the button to be focused, since I need other controls to be focused with tab change.
Any help is really appreciated :)
The AcceptButton is a property of Form and cannot be used for the UserControl. You can simply override ProcessCmdKey though and this will work so long as the user control has focus. Otherwise you will need to use the AcceptButton of the form separately or override the ProcessCmdKey in the form if you have multiple controls which could be active.
protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
if (keyData == Keys.Enter)
{
button.PerformClick();
return true;
}
return base.ProcessCmdKey(ref msg, keyData);
}
If you set the Modifier property on the button to "Public", you can use the button as AcceptButton on the form. Unfortunately you cannot do it design-time with the properties window of Visual Studio, but you can do it in code.
public Form1()
{
InitializeComponent();
this.AcceptButton = userControl11.button1;
}
I know it's an old question, and already answered, however I use this in some situations:
private void UserControl11_Load(object sender, EventArgs e)
{
this.FindForm().AcceptButton = Button1;
}
Is there anyway to check if a menu item event is coming from a click in the menu or from a short cut key being pressed?
I've tried adding event handlers to the key press and key down events, however these events aren't being "fired" when it's a shortcut key that's pressed (They do work as expected when it's not a shortcut key). I couldn't find anything in the sender object that was different between the menu click or shortcut click.
You can catch all key combinations by overriding ProcessCmdKey:
protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
if (keyData == (Keys.Control | Keys.F))
{
Console.WriteLine("My code ran from shortcut");
myFunction();
}
return base.ProcessCmdKey(ref msg, keyData);
}
private void ToolStripMenuItem_click(object sender ...)
{
Console.WriteLine("My code ran from menu item");
myFunction();
}
void myFunction()
{
//your functionality here
}
Well to get help, you should post what you have tried. (Your source)
You can use a enum for this:
enum Sender
{
Shortcut,
Menu
}
void MenuEvent(Sender sender)
{
if (sender == Sender.Shortcut)
{
}
else
{
}
}
//if you click from the menu
void btnMenuClick()
{
MenuEvent(Sender.Menu);
}
//if you use shortcut
void OnShortcutEvent()
{
MenuEvent(Sender.Shortcut);
}
Edit: I guess my answer was to vague so I edited the code. I hope its more clear now, but I must say the OP should give more details as well, such as posting some code.
I see a single solution to this problem - override the ToolStripMenuItem's ProcessCmdKey method which is raised when a shortcut is processed. In this case, you can determine when a click was caused by a shortcut. Obviously, you need to use your own class of the ToolstripMenuItem instead of the standard one.
Handle the MouseDown event to process your mouse-click.
menuItem.MouseDown += new MouseEventHandler(Process_Mouse_Click_Handler);
Handle the Click event to process your shortcut.
menuItem.Click+= new EventHandler(Process_Shortcut_Handler);
I've created custom button derived from a normal .Net button and have added the following property to add a short cut key combination:
public Keys ShortCutKey { get; set; }
I want this combination to fire the click event of the button but have no idea how to implement this when the button is placed on a form. I know the standard way of doing a button shortcut is to use the & before the short cut character but I need to use a key combination.
Any ideas?
Many Thanks
Override the form's ProcessCmdKey() method to detect shortcut keystrokes. Like this:
private bool findShortCut(Control.ControlCollection ctls, Keys keydata) {
foreach (Control ctl in ctls) {
var btn = ctl as MyButton;
if (btn != null && btn.ShortCutKey == keydata) {
btn.PerformClick();
return true;
}
if (findShortCut(ctl.Controls, keydata)) return true;
}
return false;
}
protected override bool ProcessCmdKey(ref Message msg, Keys keyData) {
if (findShortCut(this.Controls, keyData)) return true;
return base.ProcessCmdKey(ref msg, keyData);
}
Where MyButton is assumed to be your custom button control class.
I'm assuming you are using WinForms, given that the ampersand character is used in WinForms control captions to denote the shortcut character. If that is the case, then you can use the Button.PerformClick() method on a WinForms Button in order to fire the Click event manually.
If this is not the case and you are, in fact, using WPF; then take a look at the link Dmitry has posted in his comment for WPF Input Bindings.