Я создал элемент управления InfoProgressBar, который использует элемент управления TransparentLabel. Тестируя форму с таймером, я получаю некоторые небольшие сбои, отображающие текст каждые 30-40 изменений значений, если использовать интервал таймера менее 250 миллисекунд (вероятно, из-за того, что время, необходимое для обновления экрана, больше, чем интервал таймера) .
Можно изменить метод UpdateText, чтобы вставить все вычисленные значения в CustomText, но это пока не то, что мне было нужно. Это устранит необходимость в свойстве DisplayType и будет перечислять.
Класс TransparentLabel был создан путем добавления нового UserControl и изменения его на наследование от Label со следующей реализацией:
using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
namespace Utils.GUI
{
public partial class TransparentLabel : Label
{
// hide the BackColor attribute as much as possible.
// setting the base value has no effect as drawing the
// background is disabled
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public override Color BackColor
{
get
{
return Color.Transparent;
}
set
{
}
}
protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
cp.ExStyle |= 0x20; // WS_EX_TRANSPARENT
return cp;
}
}
public override string Text
{
get
{
return base.Text;
}
set
{
base.Text = value;
if(Parent != null) Parent.Invalidate(Bounds, false);
}
}
public override ContentAlignment TextAlign
{
get
{
return base.TextAlign;
}
set
{
base.TextAlign = value;
if(Parent != null) Parent.Invalidate(Bounds, false);
}
}
public TransparentLabel()
{
InitializeComponent();
SetStyle(ControlStyles.Opaque, true);
SetStyle(ControlStyles.OptimizedDoubleBuffer, false);
base.BackColor = Color.Transparent;
}
protected override void OnMove(EventArgs e)
{
base.OnMove(e);
RecreateHandle();
}
protected override void OnPaintBackground(PaintEventArgs pevent)
{
// do nothing
}
}
}
Я не внес никаких изменений в соответствующий код конструктора, но здесь он приведен для полноты.
namespace Utils.GUI
{
partial class TransparentLabel
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if(disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Component Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
components = new System.ComponentModel.Container();
}
#endregion
}
}
Затем я создал еще один новый UserControl и изменил его на производный от ProgressBar со следующей реализацией:
using System.Collections;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Drawing;
using System.Windows.Forms;
using System.Windows.Forms.Design;
using System.Windows.Forms.Design.Behavior;
namespace Utils.GUI
{
[Designer(typeof(InfoProgressBarDesigner))]
public partial class InfoProgressBar : ProgressBar
{
// designer class to add font baseline snapline by copying it from the label
private class InfoProgressBarDesigner : ControlDesigner
{
public override IList SnapLines
{
get
{
IList snapLines = base.SnapLines;
InfoProgressBar control = Control as InfoProgressBar;
if(control != null)
{
using(IDesigner designer = TypeDescriptor.CreateDesigner(control.lblText, typeof(IDesigner)))
{
if(designer != null)
{
designer.Initialize(control.lblText);
ControlDesigner boxDesigner = designer as ControlDesigner;
if(boxDesigner != null)
{
foreach(SnapLine line in boxDesigner.SnapLines)
{
if(line.SnapLineType == SnapLineType.Baseline)
{
snapLines.Add(new SnapLine(SnapLineType.Baseline, line.Offset, line.Filter, line.Priority));
break;
}
}
}
}
}
}
return snapLines;
}
}
}
// enum to select the type of displayed value
public enum ProgressBarDisplayType
{
Custom = 0,
Percent = 1,
Progress = 2,
Remain = 3,
Value = 4,
}
private string _customText;
private ProgressBarDisplayType _displayType;
private int _range;
[Bindable(false)]
[Browsable(true)]
[DefaultValue("{0}")]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
[EditorBrowsable(EditorBrowsableState.Always)]
// {0} is replaced with the result of the selected calculation
public string CustomText
{
get
{
return _customText;
}
set
{
_customText = value;
UpdateText();
}
}
[Bindable(false)]
[Browsable(true)]
[DefaultValue(ProgressBarDisplayType.Percent)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
[EditorBrowsable(EditorBrowsableState.Always)]
public ProgressBarDisplayType DisplayType
{
get
{
return _displayType;
}
set
{
_displayType = value;
UpdateText();
}
}
[Bindable(false)]
[Browsable(true)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
[EditorBrowsable(EditorBrowsableState.Always)]
// don't use the lblText font as if it is null, it checks the parent font (i.e. this property) and gives an infinite loop
public override Font Font
{
get
{
return base.Font;
}
set
{
base.Font = value;
}
}
[Bindable(false)]
[Browsable(true)]
[DefaultValue(100)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
[EditorBrowsable(EditorBrowsableState.Always)]
public new int Maximum
{
get
{
return base.Maximum;
}
set
{
base.Maximum = value;
_range = base.Maximum - base.Minimum;
UpdateText();
}
}
[Bindable(false)]
[Browsable(true)]
[DefaultValue(0)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
[EditorBrowsable(EditorBrowsableState.Always)]
public new int Minimum
{
get
{
return base.Minimum;
}
set
{
base.Minimum = value;
_range = base.Maximum - base.Minimum;
UpdateText();
}
}
[Bindable(false)]
[Browsable(true)]
[DefaultValue(ContentAlignment.MiddleLeft)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
[EditorBrowsable(EditorBrowsableState.Always)]
public ContentAlignment TextAlign
{
get
{
return lblText.TextAlign;
}
set
{
lblText.TextAlign = value;
}
}
[Bindable(false)]
[Browsable(true)]
[DefaultValue(typeof(Color), "0x000000")]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
[EditorBrowsable(EditorBrowsableState.Always)]
public Color TextColor
{
get
{
return lblText.ForeColor;
}
set
{
lblText.ForeColor = value;
}
}
[Bindable(false)]
[Browsable(true)]
[DefaultValue(0)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
[EditorBrowsable(EditorBrowsableState.Always)]
public new int Value
{
get
{
return base.Value;
}
set
{
base.Value = value;
UpdateText();
}
}
public InfoProgressBar()
{
InitializeComponent();
CustomText = "{0}";
DisplayType = ProgressBarDisplayType.Percent;
Maximum = 100;
Minimum = 0;
TextAlign = ContentAlignment.MiddleLeft;
TextColor = Color.Black;
Value = 0;
// means the label gets drawn in front of the progress bar
lblText.Parent = this;
_range = base.Maximum - base.Minimum;
}
protected void UpdateText()
{
switch(DisplayType)
{
case ProgressBarDisplayType.Custom:
{
lblText.Text = _customText;
break;
}
case ProgressBarDisplayType.Percent:
{
if(_range > 0)
{
lblText.Text = string.Format(_customText, string.Format("{0}%", (int)((Value * 100) / _range)));
}
else
{
lblText.Text = "100%";
}
break;
}
case ProgressBarDisplayType.Progress:
{
lblText.Text = string.Format(_customText, (Value - Minimum));
break;
}
case ProgressBarDisplayType.Remain:
{
lblText.Text = string.Format(_customText, (Maximum - Value));
break;
}
case ProgressBarDisplayType.Value:
{
lblText.Text = string.Format(_customText, Value);
break;
}
}
}
public new void Increment(int value)
{
base.Increment(value);
UpdateText();
}
public new void PerformStep()
{
base.PerformStep();
UpdateText();
}
}
}
И код конструктора:
namespace Utils.GUI
{
partial class InfoProgressBar
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if(disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Component Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.lblText = new Utils.GUI.TransparentLabel();
this.SuspendLayout();
//
// lblText
//
this.lblText.BackColor = System.Drawing.Color.Transparent;
this.lblText.Dock = System.Windows.Forms.DockStyle.Fill;
this.lblText.Location = new System.Drawing.Point(0, 0);
this.lblText.Name = "lblText";
this.lblText.Padding = new System.Windows.Forms.Padding(3, 0, 3, 0);
this.lblText.Size = new System.Drawing.Size(100, 23);
this.lblText.TabIndex = 0;
this.lblText.Text = "transparentLabel1";
this.ResumeLayout(false);
}
#endregion
private TransparentLabel lblText;
}
}