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different approach to independent scrolling, involving ArdourCanvas::ScrollGroup

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The idea now is that a scroll group item can be added to the canvas which will causes its children to scroll in either or both
directions (horizontal or vertical). There are few complications: the position() of the ScrollGroup is ambiguous depending
on whether you want it with scroll taken into account or not, so Item::canvas_position() was added, which defaults to
the same value as Item::position() but is overridden by ScrollGroup to return the position independent of scrolling. This
method is used when translating between item/canvas/window coordinate systems.

Note that the basic idea is that we MOVE the scroll group when a scroll happens. This mirrors what happens in the GnomeCanvas,
where Nick Mainsbridge came up with a great idea that allowed unification of the time bar and track canvases.
This commit is contained in:
Paul Davis 2014-05-20 23:08:15 -04:00
parent 6e91e9fd5f
commit cb9453b475
14 changed files with 200 additions and 122 deletions
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26
libs/canvas/wave_view.cc
View file

@ -219,7 +219,7 @@ WaveView::draw_image (PeakData* _peaks, int n_peaks) const
if (_logscaled) {
for (int i = 0; i < n_peaks; ++i) {
tips[i].bot = height();
tips[i].top = position (alt_log_meter (fast_coefficient_to_dB (max (fabs (_peaks[i].max), fabs (_peaks[i].min)))));
tips[i].top = y_extent (alt_log_meter (fast_coefficient_to_dB (max (fabs (_peaks[i].max), fabs (_peaks[i].min)))));
if (fabs (_peaks[i].max) >= clip_level) {
tips[i].clip_max = true;
@ -231,7 +231,7 @@ WaveView::draw_image (PeakData* _peaks, int n_peaks) const
}
} else {for (int i = 0; i < n_peaks; ++i) {
tips[i].bot = height();
tips[i].top = position (max (fabs (_peaks[i].max), fabs (_peaks[i].min)));
tips[i].top = y_extent (max (fabs (_peaks[i].max), fabs (_peaks[i].min)));
if (fabs (_peaks[i].max) >= clip_level) {
tips[i].clip_max = true;
@ -259,19 +259,19 @@ WaveView::draw_image (PeakData* _peaks, int n_peaks) const
}
if (top > 0.0) {
top = position (alt_log_meter (fast_coefficient_to_dB (top)));
top = y_extent (alt_log_meter (fast_coefficient_to_dB (top)));
} else if (top < 0.0) {
top = position (-alt_log_meter (fast_coefficient_to_dB (-top)));
top = y_extent (-alt_log_meter (fast_coefficient_to_dB (-top)));
} else {
top = position (0.0);
top = y_extent (0.0);
}
if (bot > 0.0) {
bot = position (alt_log_meter (fast_coefficient_to_dB (bot)));
bot = y_extent (alt_log_meter (fast_coefficient_to_dB (bot)));
} else if (bot < 0.0) {
bot = position (-alt_log_meter (fast_coefficient_to_dB (-bot)));
bot = y_extent (-alt_log_meter (fast_coefficient_to_dB (-bot)));
} else {
bot = position (0.0);
bot = y_extent (0.0);
}
tips[i].top = top;
@ -289,8 +289,8 @@ WaveView::draw_image (PeakData* _peaks, int n_peaks) const
tips[i].clip_min = true;
}
tips[i].top = position (_peaks[i].min);
tips[i].bot = position (_peaks[i].max);
tips[i].top = y_extent (_peaks[i].min);
tips[i].bot = y_extent (_peaks[i].max);
}
@ -402,8 +402,8 @@ WaveView::draw_image (PeakData* _peaks, int n_peaks) const
set_source_rgba (context, _zero_color);
context->set_line_width (1.0);
context->move_to (0, position (0.0) + 0.5);
context->line_to (n_peaks, position (0.0) + 0.5);
context->move_to (0, y_extent (0.0) + 0.5);
context->line_to (n_peaks, y_extent (0.0) + 0.5);
context->stroke ();
}
}
@ -668,7 +668,7 @@ WaveView::region_resized ()
}
Coord
WaveView::position (double s) const
WaveView::y_extent (double s) const
{
/* it is important that this returns an integral value, so that we
can ensure correct single pixel behaviour.