/// <summary>Create a progress form for external control via the UpdateProgress method</summary>
public ProgressForm(string title, string desc, Icon icon, ProgressBarStyle style)
{
using (this.SuspendLayout(true))
{
// Note: No point in setting DialogResult, ShowDialog resets it to None
AutoScaleMode = AutoScaleMode.Font;
AutoScaleDimensions = new SizeF(6F, 13F);
AutoSizeMode = AutoSizeMode.GrowOnly;
StartPosition = FormStartPosition.CenterParent;
FormBorderStyle = FormBorderStyle.FixedDialog;
ClientSize = new Size(136, 20);
HideOnClose = false;
m_progress = new TextProgressBar
{
Style = style,
Anchor = AnchorStyles.Left | AnchorStyles.Right | AnchorStyles.Top,
MarqueeAnimationSpeed = 30,
};
m_description = new Label
{
Text = desc ?? string.Empty,
AutoSize = false,
Anchor = AnchorStyles.Top | AnchorStyles.Left
};
m_btn_cancel = new Button
{
Text = "Cancel",
UseVisualStyleBackColor = true,
TabIndex = 1,
Anchor = AnchorStyles.Bottom | AnchorStyles.Right
};
m_btn_cancel.Click += (s, a) =>
{
if (CancelSignal != null)
{
CancelSignal.Set();
}
m_btn_cancel.Text = "Cancelling...";
m_btn_cancel.Enabled = false;
Enabled = false;
};
Text = title ?? string.Empty;
if (icon != null)
{
Icon = icon;
}
Controls.Add(m_description);
Controls.Add(m_progress);
Controls.Add(m_btn_cancel);
}
}
protected override void OnFormClosing(FormClosingEventArgs e)
{
// If cancel isn't allowed, ignore the Red X
if (e.CloseReason == CloseReason.UserClosing && !AllowCancel)
{
e.Cancel = true;
return;
}
// If the dialog was cancelled, ensure the 'CancelPending' flag is set
if (DialogResult == DialogResult.Cancel && CancelSignal != null)
{
CancelSignal.Set();
}
// Set the dialog result based on the state of 'CancelSignal'.
DialogResult =
CancelPending ? DialogResult.Cancel :
DialogResult.OK;
base.OnFormClosing(e);
// If the form is hide on close and the user is closing, then just
// hide the UI. The background thread is not automatically cancelled.
if (HideOnClose && e.CloseReason == CloseReason.UserClosing)
{
Hide();
e.Cancel = true;
Owner?.Focus();
return;
}
// If the form will be disposed and there is a Cancel event, automatically
// signal Cancel as a convenience for terminating the worker thread.
// Worker threads that don't test for 'CancelPending' will have to
// prevent the form from closing until finished.
if (CancelSignal != null)
{
CancelSignal.Set();
}
}