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drag_pointer(): add use_treshold parameter

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This commit is contained in:
Albert Safin
2018-12-12 15:35:11 +07:00
parent 2795c51d4b
commit 551ec20941
4 changed files with 62 additions and 21 deletions
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51
src/drag.c
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@ -20,16 +20,32 @@ struct drag_x11_cb {
* drag of the resize handle. */
Con *con;
/* The original event that initiated the drag. */
const xcb_button_press_event_t *event;
/* The dimensions of con when the loop was started. */
Rect old_rect;
/* The callback to invoke after every pointer movement. */
callback_t callback;
/* Drag distance threshold exceeded. If use_threshold is not set, then
* threshold_exceeded is always true. */
bool threshold_exceeded;
/* Cursor to set after the threshold is exceeded. */
xcb_cursor_t xcursor;
/* User data pointer for callback. */
const void *extra;
};
static bool threshold_exceeded(uint32_t x1, uint32_t y1,
uint32_t x2, uint32_t y2) {
const uint32_t threshold = 9;
return (x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2) > threshold * threshold;
}
static bool drain_drag_events(EV_P, struct drag_x11_cb *dragloop) {
xcb_motion_notify_event_t *last_motion_notify = NULL;
xcb_generic_event_t *event;
@ -105,15 +121,29 @@ static bool drain_drag_events(EV_P, struct drag_x11_cb *dragloop) {
return true;
}
if (!dragloop->threshold_exceeded &&
threshold_exceeded(last_motion_notify->root_x, last_motion_notify->root_y,
dragloop->event->root_x, dragloop->event->root_y)) {
if (dragloop->xcursor != XCB_NONE) {
xcb_change_active_pointer_grab(
conn,
dragloop->xcursor,
XCB_CURRENT_TIME,
XCB_EVENT_MASK_BUTTON_RELEASE | XCB_EVENT_MASK_POINTER_MOTION);
}
dragloop->threshold_exceeded = true;
}
/* Ensure that we are either dragging the resize handle (con is NULL) or that the
* container still exists. The latter might not be true, e.g., if the window closed
* for any reason while the user was dragging it. */
if (!dragloop->con || con_exists(dragloop->con)) {
if (dragloop->threshold_exceeded && (!dragloop->con || con_exists(dragloop->con))) {
dragloop->callback(
dragloop->con,
&(dragloop->old_rect),
last_motion_notify->root_x,
last_motion_notify->root_y,
dragloop->event,
dragloop->extra);
}
FREE(last_motion_notify);
@ -133,12 +163,18 @@ static void xcb_drag_prepare_cb(EV_P_ ev_prepare *w, int revents) {
* This function grabs your pointer and keyboard and lets you drag stuff around
* (borders). Every time you move your mouse, an XCB_MOTION_NOTIFY event will
* be received and the given callback will be called with the parameters
* specified (client, border on which the click originally was), the original
* rect of the client, the event and the new coordinates (x, y).
* specified (client, the original event), the original rect of the client,
* and the new coordinates (x, y).
*
* If use_threshold is set, dragging only starts after the user moves the
* pointer past a certain threshold. That is, the cursor will not be set and the
* callback will not be called until then.
*
*/
drag_result_t drag_pointer(Con *con, const xcb_button_press_event_t *event, xcb_window_t confine_to,
int cursor, callback_t callback, const void *extra) {
drag_result_t drag_pointer(Con *con, const xcb_button_press_event_t *event,
xcb_window_t confine_to, int cursor,
bool use_threshold, callback_t callback,
const void *extra) {
xcb_cursor_t xcursor = (cursor && xcursor_supported) ? xcursor_get_cursor(cursor) : XCB_NONE;
/* Grab the pointer */
@ -153,7 +189,7 @@ drag_result_t drag_pointer(Con *con, const xcb_button_press_event_t *event, xcb_
XCB_GRAB_MODE_ASYNC, /* pointer events should continue as normal */
XCB_GRAB_MODE_ASYNC, /* keyboard mode */
confine_to, /* confine_to = in which window should the cursor stay */
xcursor, /* possibly display a special cursor */
use_threshold ? XCB_NONE : xcursor, /* possibly display a special cursor */
XCB_CURRENT_TIME);
if ((reply = xcb_grab_pointer_reply(conn, cookie, &error)) == NULL) {
@ -189,7 +225,10 @@ drag_result_t drag_pointer(Con *con, const xcb_button_press_event_t *event, xcb_
struct drag_x11_cb loop = {
.result = DRAGGING,
.con = con,
.event = event,
.callback = callback,
.threshold_exceeded = !use_threshold,
.xcursor = xcursor,
.extra = extra,
};
ev_prepare *prepare = &loop.prepare;