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46 lines
1.9 KiB
C
46 lines
1.9 KiB
C
#ifndef FT_CONTROLLER_CLICK_H
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#define FT_CONTROLLER_CLICK_H
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#include <math.h>
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#include <linux/input-event-codes.h>
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#include "vr.h"
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struct ft_controller_click {
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bool held, dragging;
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int screen;
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uint32_t buttons;
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double x, y, threshold, radius;
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unsigned long suppressed, clicks, drags;
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};
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// Hold the desktop position at press time until movement exceeds a logical-pixel
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// radius. No timer, delayed button-down, or change to native mouse input.
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static inline bool ft_controller_click_filter(struct ft_controller_click *c,
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struct ft_event *e, double scale) {
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if (e->type == FT_BUTTON && e->button >= BTN_LEFT && e->button < BTN_LEFT+8) {
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uint32_t bit = 1u << (e->button-BTN_LEFT);
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if (e->pressed) c->buttons |= bit; else c->buttons &= ~bit;
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}
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if (e->type == FT_BUTTON && e->pressed) {
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if (e->button == BTN_LEFT && !c->held && c->threshold > 0) {
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c->held = true; c->dragging = false; c->screen = e->screen;
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c->x = e->x; c->y = e->y; c->radius = c->threshold * scale;
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} else if (e->button != BTN_LEFT) {
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c->held = false; // Multi-button gestures retain their usual semantics.
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}
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} else if (e->type == FT_MOTION && c->held && !c->dragging) {
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if (e->screen == c->screen && hypot(e->x-c->x, e->y-c->y) <= c->radius) {
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++c->suppressed;
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return false;
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}
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c->dragging = true; ++c->drags;
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} else if (e->type == FT_BUTTON && e->button == BTN_LEFT && !e->pressed && c->held) {
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if (!c->dragging) {
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e->screen = c->screen; e->x = c->x; e->y = c->y;
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++c->clicks;
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}
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c->held = false; c->dragging = false;
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} else if (e->type == FT_LEAVE && c->held) {
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return false; // Preserve the implicit grab through tiny edge excursions.
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}
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return true;
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}
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#endif
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