[英]Changing opacity of one form using a second form
So I want my form2's Trackbar
to change the opacity of my form1 but it doesn't seem to get the job done? 所以我想让我的form2的
Trackbar
更改我的form1的不透明度,但似乎无法完成工作吗?
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}
private void trackBar1_Scroll(object sender, EventArgs e)
{
Form1 frm1 = new Form1();
frm1.Opacity = trackBar1.Value * 000.1d;
}
}
You are not changing the opacity of your Form1, you are changing the opacity of a new Form1. 你是不是改变你的 Form1的透明度,要更改一个新的 Form1的不透明度。 You need to make sure you change the opacity of the form instance you want to change:
您需要确保更改了要更改的表单实例的不透明度:
public partial class Form2 : Form
{
private Form1 form;
public Form2(Form1 form)
{
InitializeComponent();
this.form = form;
}
private void trackBar1_Scroll(object sender, EventArgs e)
{
form.Opacity = trackBar1.Value * 000.1d;
}
}
}
Then when you create Form2, pass the instance of Form1 you want to change. 然后在创建Form2时,传递要更改的Form1实例。 For example from a button in your Form1:
例如,从Form1中的按钮:
public void opacityChangeButton_Click(object sender , EventArgs e)
{
Form2 opacityChangeForm = new Form2(this);
opacityChangeForm.ShowDialog();
}
Instead of creating a new form everytime use the id of the existing form: 不必每次都使用现有表单的ID来创建新表单:
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}
private void trackBar1_Scroll(object sender, EventArgs e)
{
// Do not create a new form: Form1 frm1 = new Form1();
// Use name of original form
whateverVariableyourCreateedForYourForm.Opacity = trackBar1.Value * 000.1d;
}
}
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