I am trying to programmatically set a tooltip for a label (added at runtime) on a UserControl within a form. The button used to trigger the code is on the user control itself. The problem is that when I click the button the tooltip is not assigned. However if I use basically the same code on the parent form and put it behind a button on the parent form, I can assign a tooltip to a label on the parent form. Also if I add the label to user control prior to running it works as well.
The following code is from a button on the user control that sits on the main form.
private void button1_Click(object sender, EventArgs e)
{
Label lblTest = new Label();
lblTest.Text = "Test";
ToolTip tt = new ToolTip();
tt.SetToolTip(lblTest, "ToolTipTest");
this.Controls.Add(lblTest);
lblTest.Location = new Point(10, 10);
}
Any help will be much appreciated.
You can try showing the tooltip manually. Use this code like this:
ToolTip tt = null;
private void button1_Click(object sender, EventArgs e)
{
Label lblTest = new Label();
lblTest.Text = "Test";
tt = new ToolTip();
this.Controls.Add(lblTest);
lblTest.MouseHover += new EventHandler(label_Hover);
lblTest.Location = new Point(10, 10);
}
private void label_Hover(object sender, EventArgs e)
{
tt.Show((Label)sender, "Tooltip");
}
The code in bold are my additions and/or modifications.
Most likely, the ToolTip object goes out of scope after the Click Event. Can you try declaring it outside your Click Event:
ToolTip tt = new ToolTip();
private void button1_Click(object sender, EventArgs e)
{
// and so on...
Related
I've a user control with 2 labels and two textboxes. When the label is clicked the textbox's visible prop is set to true. Here's the code I've used:
private void label_Heading_Click(object sender, EventArgs e)
{
label_Heading.Visible = false;
textBox_Heading.Text = label_Heading.Text;
textBox_Heading.Visible = true;
textBox_Heading.Focus();
}
After the textbox lose focus, it's visible prop is set to false and the label is updated with the text. Code:
private void textBox_Heading_Leave(object sender, EventArgs e)
{
textBox_Heading.Visible = false;
if(textBox_Heading.Text != "")
label_Heading.Text = textBox_Heading.Text;
label_Heading.Visible = true;
}
The code to create user controls on click:
private void label1_Click(object sender, EventArgs e)
{
TaskCard _taskCard = new TaskCard(++TOTAL_ITEM_COUNT, PanelName);
panel_DeletedItem.Controls.Add(_taskCard);
panel_DeletedItem.Refresh();
}
These code work fine when a single user control of this type is added to a panel. But if I add more than one, the code works only for the first user control, but it wont work for the new ones, although the event is fired for every user control. What am I missing here? Please suggest.
If I add a mbox to this code, the mbox is displayed for any control, but the rest of the code won't work, except for the first one.
private void label_Heading_Click(object sender, EventArgs e)
{
MessageBox.Show("Test"); // this will display, but the rest of the code is not executed or changes are not visible, i.e., the teboxes are not displayed even if I click the labels
label_Heading.Visible = false;
textBox_Heading.Text = label_Heading.Text;
textBox_Heading.Visible = true;
textBox_Heading.Focus();
}
I want to display a ToolTip of a Button immediately after clicking on it. The ToolTip should then disappear after a short period of time. This is needed only as a feedback for the user since clicking on the Button causes a string to be copied to the Clipboard.
I used an Button-Behavior to display the Tooltip of the Button via the Click-Event. To display the ToolTip I set its IsOpen property to true.
class ForceToolTipBehavior : Behavior<Button>
{
protected override void OnAttached()
{
base.OnAttached();
this.AssociatedObject.Click += AssociatedObject_Click;
}
private void AssociatedObject_Click(object sender, System.Windows.RoutedEventArgs e)
{
var tooltip = this.AssociatedObject.ToolTip as ToolTip;
tooltip = new ToolTip();
tooltip.Content = "Log was copied to your Clipboard";
tooltip.IsOpen = true;
}
}
This works just fine but the ToolTip stays open. Is there any elegant way make the ToolTip disappear after like a second? Is it possible to use the ToolTipService for that task?
Simple and quick way:
private void AssociatedObject_Click(object sender, System.Windows.RoutedEventArgs e)
{
var tooltip = this.AssociatedObject.ToolTip as ToolTip;
tooltip = new ToolTip();
tooltip.Content = "Log was copied to your Clipboard";
tooltip.IsOpen = true;
HideToolTip(tooltip);
}
private async void HideToolTip(ToolTip toolTip)
{
await Task.Delay(3 * 1000); // 3 second
toolTip.IsOpen = false;
}
As described in the title, I have a Form with a Datagridview on the front. The datagridview is smaller than my form in the back and I want the Datagridview to disappear whenever I click anywhere else but the Datagridview.
My code looks like this:
this.dataGridView1.Leave += new System.EventHandler(this.focus);
and the Eventhandler is defined like this:
private void focus(object sender, EventArgs e)
{
if(dataGridView1.Focused == false)
{
dataGridView1.Visible = false;
}
}
My problem is that my Datagridview only disappears when a new event in my form is activated but not when I click for example in a textbox on my form.
Can anyone help me?
The Leave event will not raise if you click on Form, or a ToolStripButton, PictureBox or any other non-selectable control.
If you expect a behavior like a dropdown, you can host DataGridView in a ToolStripControlHost and show it using a ToolStripDropDown. This way when you click anywhere outside the `DataGridView, it will disappear. It will act like a dropdown menu. Also the grid can be larger than your form:
private void button1_Click(object sender, EventArgs e)
{
this.dataGridView1.Margin = new Padding(0);
var host = new ToolStripControlHost(this.dataGridView1);
this.dataGridView1.MinimumSize = new Size(200, 100);
host.Padding = new Padding(0);
var dropdown = new ToolStripDropDown();
dropdown.Padding = new Padding(0);
dropdown.Items.Add(host);
dropdown.Show(button1, 0,button1.Height);
}
Important Note: It's an example. It's better to pay attention to disposing of objects in a real world application. For example, use just a single ToolStripdropDown and dispose it when closing the form.
Change the event handler assigning to:
this.dataGridView1.Leave += new System.EventHandler(fokussiert);
Worked for me when focusing on a textbox
you want your dgv also to disapear when you click on your textbox? is that what you mean?
private void dataGridView1_Leave(object sender, EventArgs e)
{
dataGridView1.Visible = false;
}
private void Form1_Click(object sender, EventArgs e)
{
dataGridView1.Visible = false;
}
In Win Forms I have these three test methods. First to create a button, second to create a tab control with two tabs and third to move created button to first tab.
private void button1_Click(object sender, EventArgs e)
{
Button przycisk = new Button();
przycisk.Location = new Point(24, 250);
przycisk.Name = "nowy";
przycisk.Text = "utworzony";
przycisk.Width = 131;
przycisk.Height = 23;
Controls.Add(przycisk);
}
private void button2_Click(object sender, EventArgs e)
{
TabControl zakladki = new TabControl();
zakladki.Location = new Point(208, 160);
zakladki.Name = "zakl";
zakladki.Height = 150;
zakladki.Width = 208;
zakladki.TabPages.Add("zakladka1", "pierwsza");
zakladki.TabPages.Add("zakladka2", "druga");
Controls.Add(zakladki);
}
private void button3_Click(object sender, EventArgs e)
{
TabControl zakladki = (TabControl)Controls.Find("zakl", false).FirstOrDefault();
int numerZakladki = 1;
foreach (TabPage zakladka in zakladki.TabPages)
{
Control kt = Controls["nowy"];
kt.Location = new Point(10, 10); // System.NullReferenceException
zakladka.Controls.Add(kt);
numerZakladki++;
}
}
I'm having a hard time to understand the behavior upon trying to change the referenced button location. The code above throws System.NullReferenceException, but when I do
if (kt != null)
{
kt.Location = new Point(10, 10);
}
it works as expected. Can anyone explain it to me ?
The new TabControl contains two Tabs.
If you move the button to the first Tab, the control at the Main form is null.
Code without Loop:
private void button3_Click(object sender, EventArgs e)
{
TabControl zakladki = (TabControl)Controls.Find("zakl", false).FirstOrDefault();
Control kt = Controls["nowy"];
kt.Location = new Point(10, 10);
zakladki.TabPages[0].Controls.Add(kt);
}
Your nowy controls are added to the root control (Form I guess), but you are trying to find them in the tab pages under zakl. You have to either add the controls to the tab page, or find them in the root control, just like you did with zakl.
You move the "nowy" button from the Form.Controls to the first TabPage's Controls collection. This removes the control from the first collection, so the code throws the exception on the next iteration. A Control can have only a singleParent.
Either create the Button for each tab separately (instead of moving it), or add the Button to the first tab only (without the foreach loop).
I have made 2 user controls. First one contains a textbox and a button. In the second one there is a panel and a repeater control is used. Now when I am writing in the textbox 2nd control will open as a popup and and after focusing to textbox I am unable to write. I have searched a lot about this but nothing works.
CustomPopup customPopup;
Popup popup;
popup = new Popup(customPopup = new CustomPopup());
private void txtSearch_TextChanged(object sender, EventArgs e)
{
popup.Width = Width;
popup.Show(this);
popup.AutoClose = false;
}
In this way I am opening the popup from the textbox text changed event.
You can use this textbox event.
private void textBox1_Enter(object sender, EventArgs e)
{
}
this event call whenever textbox get focus