hashtags/lmms
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases 1 Wiki Activity

Modifier keys for mouse wheel adjustments

Browse Source 
Integrate the changes of commit 7000afb2ea into `FloatModelEditorBase`.

This commit added modifier keys for mouse wheel adjustments to the `Knob` class. The port to `FloatModelEditorBase` results in the bar control now also supporting different scales of adjustments that can be switched with the Shift, Ctrl and Alt keys.
This commit is contained in:
Michael Gregorius
2023-09-23 10:32:10 +02:00
parent 9da879d989
commit e4934132d9
1 changed files with 45 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

48
src/gui/widgets/FloatModelEditorBase.cpp
View File

@@ -282,10 +282,52 @@ void FloatModelEditorBase::paintEvent( QPaintEvent * _me )
void FloatModelEditorBase::wheelEvent(QWheelEvent * we)
{
we->accept();
const float stepMult = model()->range() / 2000 / model()->step<float>();
const int inc = ((we->angleDelta().y() > 0 ) ? 1 : -1) * ((stepMult < 1 ) ? 1 : stepMult);
model()->incValue( inc );
const int deltaY = we->angleDelta().y();
float direction = deltaY > 0 ? 1 : -1;
auto * m = model();
float const step = m->step<float>();
float const range = m->range();
// This is the default number of steps or mouse wheel events that it takes to sweep
// from the lowest value to the highest value.
// It might be modified if the user presses modifier keys. See below.
float numberOfStepsForFullSweep = 100.;
auto const modKeys = we->modifiers();
if (modKeys == Qt::ShiftModifier)
{
// The shift is intended to go through the values in very coarse steps as in:
// "Shift into overdrive"
numberOfStepsForFullSweep = 10;
}
else if (modKeys == Qt::ControlModifier)
{
// The control key gives more control, i.e. it enables more fine-grained adjustments
numberOfStepsForFullSweep = 1000;
}
else if (modKeys == Qt::AltModifier)
{
// The alt key enables even finer adjustments
numberOfStepsForFullSweep = 2000;
// It seems that on some systems pressing Alt with mess with the directions,
// i.e. scrolling the mouse wheel is interpreted as pressing the mouse wheel
// left and right. Account for this quirk.
if (deltaY == 0)
{
int const deltaX = we->angleDelta().x();
if (deltaX != 0)
{
direction = deltaX > 0 ? 1 : -1;
}
}
}
// Compute the number of steps but make sure that we always do at least one step
const float stepMult = std::max(range / numberOfStepsForFullSweep / step, 1.f);
const int inc = direction * stepMult;
model()->incValue(inc);
s_textFloat->setText( displayValue() );
s_textFloat->moveGlobal( this, QPoint( width() + 2, 0 ) );