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limit transition values set in the effect controls

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This commit is contained in:
itsmattkc
2019-03-15 12:37:36 +11:00
parent a12c45dc22
commit 8c68a46416
6 changed files with 75 additions and 27 deletions
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effects/transition.cpp
+39 -1
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@@ -48,10 +48,12 @@ Transition::Transition(Clip *c, Clip *s, const EffectMeta* em) :
EffectRow* length_row = new EffectRow(this, tr("Length"), false, false);
length_field = new DoubleField(length_row, "length");
length_field->SetDefault(30);
length_field->SetMinimum(0);
length_field->SetMinimum(1);
length_field->SetDisplayType(LabelSlider::FrameNumber);
length_field->SetFrameRate(parent_clip->sequence == nullptr ?
parent_clip->cached_frame_rate() : parent_clip->sequence->frame_rate);
connect(length_field, SIGNAL(Changed()), this, SLOT(UpdateMaximumLength()));
}
TransitionPtr Transition::copy(Clip *c, Clip *s) {
@@ -119,6 +121,42 @@ TransitionPtr Transition::CreateFromMeta(Clip* c, Clip* s, const EffectMeta* em)
return nullptr;
}
void Transition::UpdateMaximumLength()
{
// Get the maximum area this transition can occupy on the clip
long maximum_length = GetMaximumEmptySpaceOnClip(parent_clip);
// If this clip is a shared transition, get the maximum area this can occupy on the other clip too
if (secondary_clip != nullptr) {
long secondary_max_length = GetMaximumEmptySpaceOnClip(secondary_clip);
maximum_length = qMin(secondary_max_length, maximum_length);
}
length_field->SetMaximum(maximum_length);
}
long Transition::GetMaximumEmptySpaceOnClip(Clip *c)
{
long maximum_transition_length = c->length();
Transition* opposite_transition;
// See if this clip has a transition on the opposite side that we need to account for
if (c->opening_transition.get() == this) {
opposite_transition = c->closing_transition.get();
} else {
opposite_transition = c->opening_transition.get();
}
// If is does, subtract the maximum length by the transition's length
if (opposite_transition != nullptr) {
maximum_transition_length -= opposite_transition->get_true_length();
}
return maximum_transition_length;
}
TransitionPtr Transition::Create(Clip* c, Clip* s, const EffectMeta* em, long length) {
TransitionPtr t(CreateFromMeta(c, s, em));
if (t != nullptr) {