When I click minimize button in my Windows Forms application, I don't want it to perform the classic Windows minimize animation (window going down to taskbar).
As far as I know, there's no Minimize event, I can just use Resize, but I have no clue how to detect if I clicked minimize button. I tried to use if ( WindowState = FormWindowState.Minimized ) { ... }, but that does the animation anyway and triggers the code after.
Is there any way to detect minimize button click? Is there any way to disable animations or is that triggered by Windows settings?
This works, but it has an unpleasant side-effect on the taskbar button. I can't think of another way, animation isn't even accessible from SystemParametersInfo().
public partial class Form1 : Form {
public Form1() {
InitializeComponent();
}
protected override void WndProc(ref Message m) {
// Catch WM_SYSCOMMAND, SC_MINIMIZE
if (m.Msg == 0x112 && m.WParam.ToInt32() == 0xf020) {
this.Hide();
this.WindowState = FormWindowState.Minimized;
this.BeginInvoke(new Action(() => this.Show()));
return;
}
base.WndProc(ref m);
}
}
Update: disabling animation on Aero is possible by pinvoking DwmSetWindowAttribute() with the DWMWA_TRANSITIONS_FORCEDISABLED attribute. See this answer.
Related
I am already aware that using ShowDialog() can cause the form to go behind to its parent form. So I look for a solution.
Many says that the solution is to pass the parent form as a parameter to the child form.
Something like this.
using(Form f = new Form1())
{
f.ShowDialog(this);// while the 'this' is the parent form calling
}
but this code still fails.
This is the scenario.
Open the child form showing the dialog, then when the child form window is still active, click show desktop (or press Window+D) then, open other application.
after opening the application minimize it or close it. now after you close or minimize the other application.
Now the child form is already behind the parent form. now you should press alt+tab or click it form the taskbar to work it again properly.
I will appreciate for any help.
Good question. It seems like then the child dialog is visible, and Windows+D is pressed, the parent form ignores the request (or possibly the OS prevents sending a minimize request to the parent form because it has an active modal dialog). Just guessing. The parent form is never sent a minimize message.
You can observe this by using TOOLS -> Spy++ and notice the lack of window messages sent to the parent window when the child dialog is showing and Windows+D is pressed. The messages received are in the orange box:
That means the parent form is never actually minimized. Windows stops painting it, but opening another window turns the painting back on.
So using the WM_ACTIVATEAPP as a reference point, force the parent form to be minimized. This has the side effect that the child dialog is made invisible. Then listen for the SC_RESTORE message, and reshow the child dialog:
public class RestoreForm : Form {
private const int SC_RESTORE = 0xF120;
private const int WM_SYSCOMMAND = 0x0112;
private const int WM_ACTIVATEAPP = 0x1C;
public RestoreForm() {
Button btn1 = new Button { Text = "ShowDialog(...)", AutoSize = true };
btn1.Click += btn1_Click;
Controls.Add(btn1);
}
protected override void WndProc(ref Message m) {
base.WndProc(ref m);
if (f2 != null) {
if (m.Msg == WM_ACTIVATEAPP) {
if (f2.WindowState == FormWindowState.Minimized) {
this.WindowState = FormWindowState.Minimized;
}
}
else if (m.Msg == WM_SYSCOMMAND) {
var w = m.WParam.ToInt32();
if (w == SC_RESTORE) {
f2.WindowState = FormWindowState.Normal;
//f2.Visible = true; // ignores staying on top of previous parent
f2.ShowDialog(this);
}
}
}
}
Form f2 = null;
void btn1_Click(object sender, EventArgs e) {
f2 = new Form { Text = "Child" };
f2.ShowDialog(this);
}
}
My closest workaround to solve this is set ShowInTaskbar and MinimizeBox to false.
Actually I can just disable ShowInTaskbar without disabling the minimize box, but there is no point, allowing the user to minimize the child form but still they cant perform any action on the parent form.
I'm making a simple CPU Usage monitor. The application is just an icon in the task bar which uses the Microsoft.WindowsAPICodePack library to display the CPU Usage of a task as an icon progress bar.
This application is currently working fine. For added value, I want to prevent the user from opening the application's form, which is blank. Currently I'm using the following code:
/// <summary>
/// Forces this window to remain minimized.
/// </summary>
private void MainForm_SizeChanged(object sender, EventArgs e)
{
if (WindowState != FormWindowState.Minimized)
WindowState = FormWindowState.Minimized;
}
This causes the form to flash on the screen for an instant and shrink back to the task bar. I'd prefer for absolutely nothing to visibly happen when the icon is clicked. Is there a way to achieve this?
Attempt 1
Following deathismyfriend's advice, I tried to hide the form. The WindowsAPICodePack throws an exception:
A valid active Window is needed to update the Taskbar.
Attempt 2
Setting this.Opacity = 0 didn't quite work. Funnily enough, the form is transparent... until you minimize it. Then it appears and shrinks to the task bar.
This worked for me. Trap WM_SYSCOMMAND and suppress SC_RESTORE / SC_MAXIMIZE:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
this.Opacity = 0; // prevent ALT-TAB preview
this.WindowState = FormWindowState.Minimized;
}
protected override void WndProc(ref Message m)
{
const int WM_SYSCOMMAND = 0x0112;
const int SC_RESTORE = 0xF120;
const int SC_MAXIMIZE = 0xF030;
if ((m.Msg == WM_SYSCOMMAND) && ((int)m.WParam == SC_RESTORE || (int)m.WParam == SC_MAXIMIZE))
{
return;
}
base.WndProc(ref m);
}
}
*Setting Opacity() to 0 (zero) did prevent the Alt-Tab preview window.
You are going against Windows interface standards to do this. That's why it is hard. The system tray is built for this type of application. You still should be able to animate an icon in the system tray to show this sort of information. Here's another question that helps with the system tray:
How can I make a .NET Windows Forms application that only runs in the System Tray?
Still not elegant, but you could set your FormBorderStyle to FormBorderStyle.None to prevent the right-click context menu on the window preview in aero and then move the form off screen:
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
Location = new Point(int.MinValue, int.MinValue);
}
Set the opacity to 1 and put the window in an offscreen location. The form will still flash, but will be invisible to the user.
I have an application that I am working on (for myself), and I want to prevent the Window from showing at all.
So far, what I have got is WindowState.Minimized so that the Form's initial state is Minimized. And when I click the app's icon in the Taskbar, I want it to remain minimized - not just Hide() it when it has shown. So I thought that something like this might work:
protected override void OnGotFocus(EventArgs e)
{
this.WindowState = WindowState.Minimized;
}
But I was wrong. So what I am thinking is that I need something that happends before OnGotFocus. The reason that just hiding it when it gets focused is not enough, is because you can see, very faintly, that it does actually show itself when you click the icon in the taskbar before this.WindowState = WindowState.Minimize gets called.
My only requirement is that the application must not be shown when it's icon is clicked on the Taskbar. I will need to show the window programatically, at some point, though.
How can I make sure that clicking its icon never shows the window?
This seemed to work for me with no "hint" of it coming and going:
protected override void WndProc(ref Message m)
{
if (m.Msg == 0x0112) //WM_SYSCOMMAND
{
if ((m.WParam.ToInt32() & 0xFFF0) == 0xF030 ||
(m.WParam.ToInt32() & 0xFFF0) == 0xF120)
m.WParam = new IntPtr(0xF020);
}
base.WndProc(ref m);
}
Just override the WndProc and this will catch both SC_MAXIMIZE (0xF030) and SC_RESTORE (0x0F120). SC_MINIMIZE is 0xF020.
As Hans has suggested, I have edited my post to mask out the low-order bits used by the system per this MSDN section: http://msdn.microsoft.com/en-us/library/windows/desktop/ms646360(v=vs.85).aspx
Hi you can use the form_resize event to trigger windowstate to minimized
private void Form1_Resize ( object sender , EventArgs e )
{
if ( WindowState == FormWindowState.Maximized )
{
// minimize it here
}
}
So here's is the situation:
I've created a custom button that minimizes my WPF application,
the thing is that it minimizes right away to the taskbar
(unlike random applications that have the Win7 minimize effect).
My question is, how can I put that regular effect on my customized button when it minimizes?
Thank you.
You could P/Invoke AnimateWindow to add the effect you want.
Use this in the Button Click event (the border cause the minimize animation)
WindowStyle = WindowStyle.SingleBorderWindow;
WindowState = WindowState.Minimized;
override OnActivate to hide again the border what the window is maximized
protected override void OnActivated(EventArgs e)
{
base.OnActivated(e);
if (WindowStyle != WindowStyle.None)
{
Dispatcher.BeginInvoke(DispatcherPriority.ApplicationIdle, (DispatcherOperationCallback)delegate(object unused)
{
WindowStyle = WindowStyle.None;
return null;
}
, null);
}
}
I'm using Windows Forms in C#.
I have a main form with a couple of toolbars that contain toolStripButtons. After working with another form that contains data, the main form loses focus and clicking on a toolStripButton does not trigger OnClick event: the first click activates the main form, and only the second click actually pushes the button. I need the user to click a button only once to trigger a Click event, any ideas on how to do that? Thanks.
Notes:
I was using MDI and there were no problems clicking on the parent's form buttons. But now the paramount is to have forms freely floating across multiple displays.
The worker forms have the main form as the Owner property, this way they stay on top of the main form.
When I click on the button of an inactive form, none of MouseHover, MouseEnter, MouseDown nor MouseUp fires. It's just main form's Activate event that fires.
There is a treeView (inside a tabControl, inside a splitContainer, inside a panel), on the main form. Its items are selected upon a first mouse click, even if the main form is inactive. I guess not all controls are equal!
What you need to do is create a class that inherits ToolStrip and handles the WndProc. This is one way to do it. There are others.
private class MyToolStrip : ToolStrip
{
private const uint WM_LBUTTONDOWN = 0x201;
private const uint WM_LBUTTONUP = 0x202;
private static bool down = false;
protected override void WndProc(ref Message m)
{
if (m.Msg == WM_LBUTTONUP && !down)
{
m.Msg = (int)WM_LBUTTONDOWN;
base.WndProc(ref m);
m.Msg = (int)WM_LBUTTONUP;
}
if (m.Msg == WM_LBUTTONDOWN) down = true;
if (m.Msg == WM_LBUTTONUP) down = false;
base.WndProc(ref m);
}
}
I've also seen this solution:
protected override void WndProc(ref Message m)
{
// WM_MOUSEACTIVATE = 0x21
if (m.Msg == WM_MOUSEACTIVATE && this.CanFocus && !this.Focused)
this.Focus();
base.WndProc(ref m);
}
I ran into this at the last place I worked, I think the solution I came up with worked more like the latter, but I don't have access to the exact code I used.
if u have Form without borders, so this logic was working for you built in :)
form.FormBorderStyle = FormBorderStyle.None