void VerifyScroll(CmdApp app, ScrollDir dir, int clicks)
{
WinCon.CONSOLE_SCREEN_BUFFER_INFO_EX beforeScroll;
WinCon.CONSOLE_SCREEN_BUFFER_INFO_EX afterScroll;
int deltaActual;
int deltaExpected;
beforeScroll = app.GetScreenBufferInfo();
switch (dir)
{
case ScrollDir.Vertical:
app.ScrollWindow(clicks);
break;
case ScrollDir.Horizontal:
app.HScrollWindow(clicks);
break;
default:
throw new NotSupportedException();
}
// Give the window message a moment to take effect.
Globals.WaitForTimeout();
switch (dir)
{
case ScrollDir.Vertical:
deltaExpected = clicks * app.GetRowsPerScroll();
break;
case ScrollDir.Horizontal:
deltaExpected = clicks * app.GetColsPerScroll();
break;
default:
throw new NotSupportedException();
}
afterScroll = app.GetScreenBufferInfo();
switch (dir)
{
case ScrollDir.Vertical:
// Scrolling "negative" vertically is pulling the wheel downward which makes the lines move down.
// This means that if you scroll down from the top, before = 0 and after = 3. 0 - 3 = -3.
// The - sign of the delta here then aligns with the down = negative rule.
deltaActual = beforeScroll.srWindow.Top - afterScroll.srWindow.Top;
break;
case ScrollDir.Horizontal:
// Scrolling "negative" horizontally is pushing the wheel left which makes lines move left.
// This means that if you scroll left, before = 3 and after = 0. 0 - 3 = -3.
// The - sign of the delta here then aligns with the left = negative rule.
deltaActual = afterScroll.srWindow.Left - beforeScroll.srWindow.Left;
break;
default:
throw new NotSupportedException();
}
Verify.AreEqual(deltaExpected, deltaActual);
}