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feat: add smooth focus transition animation for opacity and border

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This adds animated transitions when switching focus between windows.
Both window opacity and border color now fade smoothly using cubic
bezier easing instead of changing instantly.

Implementation:
- Added animation_duration_focus config option (default 400ms)
- Added animation_curve_focus for cubic bezier easing curve
- Window opacity and border color animate together when focus changes
- Uses existing animation infrastructure (baked bezier points)

The feature is backwards compatible and can be disabled by setting
animation_duration_focus=0 in config file.

Changes affect 5 files with minimal additions to keep code clean.
This commit is contained in:
Szymon Rączka 2025-10-31 22:33:38 +01:00 • committed by DreamMaoMao
parent cbfd20bff8
commit e0f114af59
5 changed files with 86 additions and 7 deletions
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10
src/animation/common.h
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@ -9,6 +9,8 @@ struct dvec2 calculate_animation_curve_at(double t, int type) {
animation_curve = animation_curve_tag;
} else if (type == CLOSE) {
animation_curve = animation_curve_close;
} else if (type == FOCUS) {
animation_curve = animation_curve_focus;
} else {
animation_curve = animation_curve_move;
}
@ -28,6 +30,8 @@ void init_baked_points(void) {
baked_points_tag = calloc(BAKED_POINTS_COUNT, sizeof(*baked_points_tag));
baked_points_close =
calloc(BAKED_POINTS_COUNT, sizeof(*baked_points_close));
baked_points_focus =
calloc(BAKED_POINTS_COUNT, sizeof(*baked_points_focus));
for (unsigned int i = 0; i < BAKED_POINTS_COUNT; i++) {
baked_points_move[i] = calculate_animation_curve_at(
@ -45,6 +49,10 @@ void init_baked_points(void) {
baked_points_close[i] = calculate_animation_curve_at(
(double)i / (BAKED_POINTS_COUNT - 1), CLOSE);
}
for (unsigned int i = 0; i < BAKED_POINTS_COUNT; i++) {
baked_points_focus[i] = calculate_animation_curve_at(
(double)i / (BAKED_POINTS_COUNT - 1), FOCUS);
}
}
double find_animation_curve_at(double t, int type) {
@ -61,6 +69,8 @@ double find_animation_curve_at(double t, int type) {
baked_points = baked_points_tag;
} else if (type == CLOSE) {
baked_points = baked_points_close;
} else if (type == FOCUS) {
baked_points = baked_points_focus;
} else {
baked_points = baked_points_move;
}