public Panel(Imgui imgui, Vector2 startPosition, int width, int height)
{
this.imgui = imgui;
StartPosition = startPosition;
currentPosition = startPosition;
Width = width;
Height = height;
if (imgui.Mode == ImguiMode.Render)
{
imgui.DrawFilledBox(startPosition, width, height, Color.DarkBlue);
}
}
public void EndScrollableSection(ref int scrollValue)
{
if (imgui.Mode == ImguiMode.Update)
{
if (imgui.Input.GetMode(startPosition, new Vector2(width, height)) != InputMouseMode.None)
{
int scrollChange = imgui.Input.GetScrollChange() / 2;
bool lastItemDrawn = skippedHeight == 0;
if (scrollChange > 0 || (scrollChange < 0 && !lastItemDrawn))
{
scrollValue += scrollChange;
if (scrollValue > 0)
{
scrollValue = 0;
}
}
}
}
else if (imgui.Mode == ImguiMode.Render)
{
// Draw the scroll bar.
Color barColor = Color.BlueViolet;
Color darkBarColor = imgui.PushColor(barColor, -50);
int barWidth = 10;
int barSpace = 5;
int scrollFirstY = scroll + (int)startPosition.Y;
float rate = (height - 2 * barSpace) / (float)(-startScroll + height + skippedHeight);
if (rate < 1f)
{
float topBarHeight = -startScroll * rate;
float highlightHeight = height * rate;
float bottomBarHeight = skippedHeight * rate;
Vector2 position = startPosition + new Vector2(width - barWidth - barSpace, barSpace);
if (topBarHeight > 0)
{
imgui.DrawFilledBox(position, barWidth, topBarHeight, darkBarColor);
position.Y += topBarHeight;
}
// Note(ian): Our scrolling is janky and the variable scroll can get a little bigger then it should, here we try to compensate for this.
float jankyHeight = highlightHeight;
float maxJankyY = startPosition.Y + height - barSpace;
if (jankyHeight > maxJankyY - position.Y)
{
jankyHeight = maxJankyY - position.Y;
}
imgui.DrawFilledBox(position, barWidth, jankyHeight, barColor);
position.Y += jankyHeight;
if (bottomBarHeight > 0)
{
imgui.DrawFilledBox(position, barWidth, bottomBarHeight, darkBarColor);
}
}
}
}
