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Update readme, add potentiometer controls

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Max Amundsen
2026-03-03 16:12:36 -05:00
parent 9c81f21be7
commit da6e868b0f
10 changed files with 751 additions and 5 deletions
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28
src/ui/ui_widgets.h
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@@ -31,6 +31,15 @@ struct UI_WindowSlot {
int16_t z_order;
};
struct UI_KnobDragState {
uint32_t dragging_id; // Hash of the knob being dragged (0 = none)
F32 drag_start_y; // Mouse Y when drag started
F32 value_at_start; // Value when drag started
B32 was_shift; // Shift state last frame (to re-anchor on change)
uint32_t last_click_id; // Knob hash of last click (for double-click detection)
S32 last_click_frame; // Frame number of last click
};
struct UI_DragState {
uint32_t dragging_id; // Window ID currently being dragged (0 = none)
Vec2F32 drag_anchor; // Mouse position when drag started
@@ -69,6 +78,16 @@ struct UI_WidgetState {
S32 window_count;
int16_t next_z;
UI_DragState drag;
// Knob drag state
UI_KnobDragState knob_drag;
// Knob text edit state
uint32_t knob_edit_id; // Hash of knob in text edit mode (0 = none)
char knob_edit_buf[32]; // Text buffer for numeric entry
S32 knob_edit_cursor; // Cursor position in edit buffer
S32 knob_edit_sel_start; // Selection anchor
S32 knob_edit_sel_end; // Selection extent
};
extern UI_WidgetState g_wstate;
@@ -130,3 +149,12 @@ typedef void (*UI_WindowContentFn)(void *user_data);
B32 ui_window(const char *id, const char *title, B32 *open,
Vec2F32 initial_pos, Vec2F32 initial_size,
UI_WindowContentFn content_fn, void *user_data);
// Knob / potentiometer. Vertical drag to change value.
// unsigned (is_signed=0): value in [0, max_val]
// signed (is_signed=1): value in [-max_val, +max_val]
// default_val: value restored on double-click.
// editable: if true, clicking the value text opens a text input for direct entry.
// Hold Shift while dragging for fine control.
// Returns true if value changed this frame.
B32 ui_knob(const char *id, const char *label, F32 *value, F32 max_val, B32 is_signed, F32 default_val, B32 editable = 0);