ビデオを使用するためのタイムライン ユーザー コントロールを開発しています。ここに私の作品の写真があります:
ここで問題があります。currentTime が変更されたら、UI を更新する必要があります。しかし、私が this.Invalidate(); を使用すると コントロール全体をリフレッシュします。しかし、ポインタ(灰色の背景の白い線)を更新したいだけです。非常に小さな時間の変化でコントロールが何度も点滅するためです。ポインタを更新する方法は?これが私のonPaintメソッドです
private void OnPaint(object sender, System.Windows.Forms.PaintEventArgs e)
{
int width = this.Width;
int height = this.Height;
int Floor = height - FloorDistance;
Pen SecPen = new Pen(SecColor);
Pen MinPen = new Pen(MinColor);
SolidBrush TimeLineBrush = new SolidBrush(Color.Gray);
StringFormat stringFormat = new StringFormat();
SolidBrush TimesolidBrush = new SolidBrush(TimeColor);
SolidBrush BackBrush = new SolidBrush(TimlineBackColor);
SolidBrush PointerBrush = new SolidBrush(PointerColor);
stringFormat.FormatFlags = StringFormatFlags.DirectionVertical;
switch (Zoom)
{
case ZoomLEvel.Quarter:
width = (int)Math.Ceiling((TotalDuration / 900)) * ThickDistance;
break;
case ZoomLEvel.Minute:
width = (int)Math.Ceiling((TotalDuration / 60)) * ThickDistance;
break;
case ZoomLEvel.Secound:
width = (int)Math.Ceiling(TotalDuration) * ThickDistance;
break;
case ZoomLEvel.MiliSecound:
width = (int)Math.Ceiling(TotalDuration * 10) * ThickDistance;
break;
}
width += 11;
this.Width = width;
e.Graphics.FillRectangle(TimeLineBrush, 0, Floor, width, 3);
e.Graphics.FillRectangle(BackBrush, 0, 0, width, height - FloorDistance);
int x = ThickDistance;
int step = 0;
while (x <= width - ThickDistance)
{
if (step % 5 == 0)
{
e.Graphics.DrawLine(MinPen, x, Floor, x, Floor - _MinHeight);
// print time
string time = "";
double totalSecounds = 0;
PointF pointF = new PointF(x - 8, Floor + 5);
switch (Zoom)
{
case ZoomLEvel.Quarter:
totalSecounds = step * 900;
break;
case ZoomLEvel.Minute:
totalSecounds = step * 60;
break;
case ZoomLEvel.Secound:
totalSecounds = step;
break;
case ZoomLEvel.MiliSecound:
totalSecounds = step / 10d;
break;
}
time = (new TimeSpan(0, 0, 0, (int)totalSecounds, (int)(step % 10) * 100)).ToString(@"hh\:mm\:ss\:fff");
e.Graphics.DrawString(time, this.Font, TimesolidBrush, pointF, stringFormat);
}
else
e.Graphics.DrawLine(SecPen, x, Floor, x, Floor - _SecHeight);
x += ThickDistance;
step++;
}
int PointerTime = 0;//(int)Math.Floor(CurrentTime);
int pointerX = 0;
switch (Zoom)
{
case ZoomLEvel.Quarter:
PointerTime = (int)Math.Floor(CurrentTime / 900);
pointerX = PointerTime * ThickDistance;
break;
case ZoomLEvel.Minute:
PointerTime = (int)Math.Floor(CurrentTime / 60);
pointerX = PointerTime * ThickDistance;
break;
case ZoomLEvel.Secound:
PointerTime = (int)Math.Floor(CurrentTime);
pointerX = PointerTime * ThickDistance;
break;
case ZoomLEvel.MiliSecound:
PointerTime = (int)Math.Floor(CurrentTime * 10);
pointerX = PointerTime * ThickDistance;
break;
}
pointerX += 5;
e.Graphics.FillRectangle(PointerBrush, pointerX, 0, 2, height - FloorDistance);
}