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Refactor ScrollbarManager class

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This commit is contained in:
Jaex 2017-12-10 12:45:39 +03:00
parent eb030318e0
commit fa6b20a8fd
1 changed files with 45 additions and 35 deletions
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80
ShareX.ScreenCaptureLib/RegionHelpers/ScrollbarManager.cs
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@ -37,36 +37,34 @@ internal class ScrollbarManager
public bool IsHorizontalScrollbarVisible { get; private set; }
public bool IsVerticalScrollbarVisible { get; private set; }
private bool shouldDrawHorizontalScrollbar = true;
private bool shouldDrawVerticalScrollbar = true;
private bool shouldDrawHorizontalScrollbarBefore = true;
private bool shouldDrawVerticalScrollbarBefore = true;
private Stopwatch horizontalScrollbarChangeTime;
private Stopwatch verticalScrollbarChangeTime;
public int Thickness { get; set; } = 10;
public int Margin { get; set; } = 15;
public int Padding { get; set; } = 2;
// timings in milliseconds
// Timings in milliseconds
public int FadeInTime { get; set; } = 150;
public int FadeOutDelay { get; set; } = 500;
public int FadeOutTime { get; set; } = 150;
private RegionCaptureForm form;
private Rectangle horizontalTrackRectangle, horizontalThumbRectangle, verticalTrackRectangle, verticalThumbRectangle;
private bool shouldDrawHorizontalScrollbar = true;
private bool shouldDrawVerticalScrollbar = true;
private bool shouldDrawHorizontalScrollbarBefore = true;
private bool shouldDrawVerticalScrollbarBefore = true;
private Stopwatch horizontalScrollbarChangeTime;
private Stopwatch verticalScrollbarChangeTime;
private int HorizontalScrollbarOpacityLast = 255;
private int HorizontalScrollbarOpacityCurrent = 255;
private int VerticalScrollbarOpacityLast = 255;
private int VerticalScrollbarOpacityCurrent = 255;
private RegionCaptureForm form;
private Rectangle horizontalTrackRectangle, horizontalThumbRectangle, verticalTrackRectangle, verticalThumbRectangle;
public ScrollbarManager(RegionCaptureForm regionCaptureForm)
{
form = regionCaptureForm;
horizontalScrollbarChangeTime = Stopwatch.StartNew();
verticalScrollbarChangeTime = Stopwatch.StartNew();
if (form.ClientArea.Contains(form.CanvasRectangle))
{
HorizontalScrollbarOpacityLast = 0;
@ -76,35 +74,30 @@ public ScrollbarManager(RegionCaptureForm regionCaptureForm)
}
}
int opacityGain(Stopwatch changeTime)
{
return (int)Math.Min(255.0f, 255.0f * (float)changeTime.ElapsedMilliseconds / Math.Max(0, (float)FadeInTime));
}
int opacityLoss(Stopwatch changeTime)
{
int deltaTime = Math.Max(0, (int)changeTime.ElapsedMilliseconds - FadeOutDelay);
return (int)Math.Min(255.0f, 255.0f * (float)deltaTime / Math.Max(0, (float)FadeOutTime));
}
public void Update()
{
Rectangle imageRectangleVisible = form.CanvasRectangle;
imageRectangleVisible.Intersect(form.ClientArea);
shouldDrawHorizontalScrollbar = form.ShapeManager.IsPanning && (form.CanvasRectangle.Left < form.ClientArea.Left || form.CanvasRectangle.Right > form.ClientArea.Right);
shouldDrawHorizontalScrollbar = form.ShapeManager.IsPanning &&
(form.CanvasRectangle.Left < form.ClientArea.Left || form.CanvasRectangle.Right > form.ClientArea.Right);
if (shouldDrawHorizontalScrollbar ^ shouldDrawHorizontalScrollbarBefore)
if (shouldDrawHorizontalScrollbar != shouldDrawHorizontalScrollbarBefore)
{
horizontalScrollbarChangeTime = Stopwatch.StartNew();
HorizontalScrollbarOpacityLast = HorizontalScrollbarOpacityCurrent;
}
shouldDrawHorizontalScrollbarBefore = shouldDrawHorizontalScrollbar;
HorizontalScrollbarOpacityCurrent = shouldDrawHorizontalScrollbar
? HorizontalScrollbarOpacityLast + opacityGain(horizontalScrollbarChangeTime)
: HorizontalScrollbarOpacityLast - opacityLoss(horizontalScrollbarChangeTime);
HorizontalScrollbarOpacityCurrent = Math.Min(255, Math.Max(0, HorizontalScrollbarOpacityCurrent));
if (shouldDrawHorizontalScrollbar)
{
HorizontalScrollbarOpacityCurrent = HorizontalScrollbarOpacityLast + OpacityGain(horizontalScrollbarChangeTime);
}
else
{
HorizontalScrollbarOpacityCurrent = HorizontalScrollbarOpacityLast - OpacityLoss(horizontalScrollbarChangeTime);
}
HorizontalScrollbarOpacityCurrent = HorizontalScrollbarOpacityCurrent.Between(0, 255);
IsHorizontalScrollbarVisible = HorizontalScrollbarOpacityCurrent > 0;
@ -124,19 +117,25 @@ public void Update()
new Size(horizontalThumbLength, Thickness));
}
shouldDrawVerticalScrollbar = form.ShapeManager.IsPanning && (form.CanvasRectangle.Top < form.ClientArea.Top || form.CanvasRectangle.Bottom > form.ClientArea.Bottom);
shouldDrawVerticalScrollbar = form.ShapeManager.IsPanning &&
(form.CanvasRectangle.Top < form.ClientArea.Top || form.CanvasRectangle.Bottom > form.ClientArea.Bottom);
if (shouldDrawVerticalScrollbar ^ shouldDrawVerticalScrollbarBefore)
if (shouldDrawVerticalScrollbar != shouldDrawVerticalScrollbarBefore)
{
verticalScrollbarChangeTime = Stopwatch.StartNew();
VerticalScrollbarOpacityLast = VerticalScrollbarOpacityCurrent;
}
shouldDrawVerticalScrollbarBefore = shouldDrawVerticalScrollbar;
VerticalScrollbarOpacityCurrent = shouldDrawVerticalScrollbar
? VerticalScrollbarOpacityLast + opacityGain(verticalScrollbarChangeTime)
: VerticalScrollbarOpacityLast - opacityLoss(verticalScrollbarChangeTime);
VerticalScrollbarOpacityCurrent = Math.Min(255, Math.Max(0, VerticalScrollbarOpacityCurrent));
if (shouldDrawVerticalScrollbar)
{
VerticalScrollbarOpacityCurrent = VerticalScrollbarOpacityLast + OpacityGain(verticalScrollbarChangeTime);
}
else
{
VerticalScrollbarOpacityCurrent = VerticalScrollbarOpacityLast - OpacityLoss(verticalScrollbarChangeTime);
}
VerticalScrollbarOpacityCurrent = VerticalScrollbarOpacityCurrent.Between(0, 255);
IsVerticalScrollbarVisible = VerticalScrollbarOpacityCurrent > 0;
if (IsVerticalScrollbarVisible)
@ -185,5 +184,16 @@ public void Draw(Graphics g)
}
}
}
private int OpacityGain(Stopwatch changeTime)
{
return (int)Math.Min(255.0f, 255.0f * changeTime.ElapsedMilliseconds / Math.Max(0, (float)FadeInTime));
}
private int OpacityLoss(Stopwatch changeTime)
{
int deltaTime = Math.Max(0, (int)changeTime.ElapsedMilliseconds - FadeOutDelay);
return (int)Math.Min(255.0f, 255.0f * deltaTime / Math.Max(0, (float)FadeOutTime));
}
}
}