diff options
Diffstat (limited to 'lisp/mouse.el')
| -rw-r--r-- | lisp/mouse.el | 283 |
1 files changed, 174 insertions, 109 deletions
diff --git a/lisp/mouse.el b/lisp/mouse.el index 1e205283de2..93c89de91c2 100644 --- a/lisp/mouse.el +++ b/lisp/mouse.el @@ -2974,6 +2974,11 @@ in addition, temporarily highlight the original region with the :type 'boolean :version "26.1") +(defcustom mouse-drag-and-drop-region-cross-program nil + "If non-nil, allow dragging text to other programs." + :type 'boolean + :version "29.1") + (defface mouse-drag-and-drop-region '((t :inherit region)) "Face to highlight original text during dragging. This face is used by `mouse-drag-and-drop-region' to temporarily @@ -2984,6 +2989,22 @@ highlight the original region when (declare-function rectangle-dimensions "rect" (start end)) (declare-function rectangle-position-as-coordinates "rect" (position)) (declare-function rectangle-intersect-p "rect" (pos1 size1 pos2 size2)) +(declare-function x-begin-drag "xfns.c") + +(defun mouse-drag-and-drop-region-display-tooltip (tooltip) + "Display TOOLTIP, a tooltip string, using `x-show-tip'. +Call `tooltip-show-help-non-mode' instead on non-graphical displays." + (if (display-graphic-p) + (x-show-tip tooltip) + (tooltip-show-help-non-mode tooltip))) + +(defun mouse-drag-and-drop-region-hide-tooltip () + "Hide any tooltip currently displayed. +Call `tooltip-show-help-non-mode' to clear the echo area message +instead on non-graphical displays." + (if (display-graphic-p) + (x-hide-tip) + (tooltip-show-help-non-mode nil))) (defun mouse-drag-and-drop-region (event) "Move text in the region to point where mouse is dragged to. @@ -3046,117 +3067,161 @@ is copied instead of being cut." states)))) (ignore-errors - (track-mouse - (setq track-mouse 'dropping) - ;; When event was "click" instead of "drag", skip loop. - (while (progn - (setq event (read-key)) ; read-event or read-key - (or (mouse-movement-p event) - ;; Handle `mouse-autoselect-window'. - (memq (car event) '(select-window switch-frame)))) - ;; Obtain the dragged text in region. When the loop was - ;; skipped, value-selection remains nil. - (unless value-selection - (setq value-selection (funcall region-extract-function nil)) - (when mouse-drag-and-drop-region-show-tooltip - (let ((text-size mouse-drag-and-drop-region-show-tooltip)) - (setq text-tooltip - (if (and (integerp text-size) - (> (length value-selection) text-size)) - (concat - (substring value-selection 0 (/ text-size 2)) - "\n...\n" - (substring value-selection (- (/ text-size 2)) -1)) - value-selection)))) - - ;; Check if selected text is read-only. - (setq text-from-read-only - (or text-from-read-only - (catch 'loop - (dolist (bound (region-bounds)) - (when (text-property-not-all - (car bound) (cdr bound) 'read-only nil) - (throw 'loop t))))))) - - (setq window-to-paste (posn-window (event-end event))) - (setq point-to-paste (posn-point (event-end event))) - ;; Set nil when target buffer is minibuffer. - (setq buffer-to-paste (let (buf) - (when (windowp window-to-paste) - (setq buf (window-buffer window-to-paste)) - (when (not (minibufferp buf)) - buf)))) - (setq cursor-in-text-area (and window-to-paste - point-to-paste - buffer-to-paste)) - - (when cursor-in-text-area - ;; Check if point under mouse is read-only. - (save-window-excursion - (select-window window-to-paste) - (setq point-to-paste-read-only - (or buffer-read-only - (get-text-property point-to-paste 'read-only)))) - - ;; Check if "drag but negligible". Operation "drag but - ;; negligible" is defined as drag-and-drop the text to - ;; the original region. When modifier is pressed, the - ;; text will be inserted to inside of the original - ;; region. - ;; - ;; If the region is rectangular, check if the newly inserted - ;; rectangular text would intersect the already selected - ;; region. If it would, then set "drag-but-negligible" to t. - ;; As a special case, allow dragging the region freely anywhere - ;; to the left, as this will never trigger its contents to be - ;; inserted into the overlays tracking it. - (setq drag-but-negligible - (and (eq (overlay-buffer (car mouse-drag-and-drop-overlays)) - buffer-to-paste) - (if region-noncontiguous - (let ((dimensions (rectangle-dimensions start end)) - (start-coordinates - (rectangle-position-as-coordinates start)) - (point-to-paste-coordinates - (rectangle-position-as-coordinates - point-to-paste))) - (and (rectangle-intersect-p - start-coordinates dimensions - point-to-paste-coordinates dimensions) - (not (< (car point-to-paste-coordinates) - (car start-coordinates))))) - (and (<= (overlay-start - (car mouse-drag-and-drop-overlays)) - point-to-paste) - (<= point-to-paste - (overlay-end - (car mouse-drag-and-drop-overlays)))))))) - - ;; Show a tooltip. - (if mouse-drag-and-drop-region-show-tooltip - (tooltip-show text-tooltip) - (tooltip-hide)) - - ;; Show cursor and highlight the original region. - (when mouse-drag-and-drop-region-show-cursor - ;; Modify cursor even when point is out of frame. - (setq cursor-type (cond - ((not cursor-in-text-area) - nil) - ((or point-to-paste-read-only - drag-but-negligible) - 'hollow) - (t - 'bar))) - (when cursor-in-text-area - (dolist (overlay mouse-drag-and-drop-overlays) - (overlay-put overlay - 'face 'mouse-drag-and-drop-region)) - (deactivate-mark) ; Maintain region in other window. - (mouse-set-point event))))) + (catch 'cross-program-drag + (track-mouse + (setq track-mouse 'dropping) + ;; When event was "click" instead of "drag", skip loop. + (while (progn + (setq event (read-key)) ; read-event or read-key + (or (mouse-movement-p event) + ;; Handle `mouse-autoselect-window'. + (memq (car event) '(select-window switch-frame)))) + (catch 'drag-again + ;; Obtain the dragged text in region. When the loop was + ;; skipped, value-selection remains nil. + (unless value-selection + (setq value-selection (funcall region-extract-function nil)) + (when mouse-drag-and-drop-region-show-tooltip + (let ((text-size mouse-drag-and-drop-region-show-tooltip)) + (setq text-tooltip + (if (and (integerp text-size) + (> (length value-selection) text-size)) + (concat + (substring value-selection 0 (/ text-size 2)) + "\n...\n" + (substring value-selection (- (/ text-size 2)) -1)) + value-selection)))) + + ;; Check if selected text is read-only. + (setq text-from-read-only + (or text-from-read-only + (catch 'loop + (dolist (bound (region-bounds)) + (when (text-property-not-all + (car bound) (cdr bound) 'read-only nil) + (throw 'loop t))))))) + + (when (and mouse-drag-and-drop-region-cross-program + (display-graphic-p) + (fboundp 'x-begin-drag) + (framep (posn-window (event-end event))) + (let ((location (posn-x-y (event-end event))) + (frame (posn-window (event-end event)))) + (or (< (car location) 0) + (< (cdr location) 0) + (> (car location) + (frame-pixel-width frame)) + (> (cdr location) + (frame-pixel-height frame))))) + (mouse-drag-and-drop-region-hide-tooltip) + (gui-set-selection 'XdndSelection value-selection) + (let ((drag-action-or-frame + (x-begin-drag '("UTF8_STRING" "text/plain" + "text/plain;charset=utf-8" + "STRING" "TEXT" "COMPOUND_TEXT") + (if mouse-drag-and-drop-region-cut-when-buffers-differ + 'XdndActionMove + 'XdndActionCopy) + (posn-window (event-end event)) t))) + (when (framep drag-action-or-frame) + (throw 'drag-again nil)) + + (when (eq drag-action-or-frame 'XdndActionMove) + ;; Remove the dragged text from source buffer like + ;; operation `cut'. + (dolist (overlay mouse-drag-and-drop-overlays) + (delete-region (overlay-start overlay) + (overlay-end overlay)))) + + (when (eq drag-action-or-frame 'XdndActionCopy) + ;; Set back the dragged text as region on source buffer + ;; like operation `copy'. + (activate-mark))) + (throw 'cross-program-drag nil)) + + (setq window-to-paste (posn-window (event-end event))) + (setq point-to-paste (posn-point (event-end event))) + ;; Set nil when target buffer is minibuffer. + (setq buffer-to-paste (let (buf) + (when (windowp window-to-paste) + (setq buf (window-buffer window-to-paste)) + (when (not (minibufferp buf)) + buf)))) + (setq cursor-in-text-area (and window-to-paste + point-to-paste + buffer-to-paste)) + + (when cursor-in-text-area + ;; Check if point under mouse is read-only. + (save-window-excursion + (select-window window-to-paste) + (setq point-to-paste-read-only + (or buffer-read-only + (get-text-property point-to-paste 'read-only)))) + + ;; Check if "drag but negligible". Operation "drag but + ;; negligible" is defined as drag-and-drop the text to + ;; the original region. When modifier is pressed, the + ;; text will be inserted to inside of the original + ;; region. + ;; + ;; If the region is rectangular, check if the newly inserted + ;; rectangular text would intersect the already selected + ;; region. If it would, then set "drag-but-negligible" to t. + ;; As a special case, allow dragging the region freely anywhere + ;; to the left, as this will never trigger its contents to be + ;; inserted into the overlays tracking it. + (setq drag-but-negligible + (and (eq (overlay-buffer (car mouse-drag-and-drop-overlays)) + buffer-to-paste) + (if region-noncontiguous + (let ((dimensions (rectangle-dimensions start end)) + (start-coordinates + (rectangle-position-as-coordinates start)) + (point-to-paste-coordinates + (rectangle-position-as-coordinates + point-to-paste))) + (and (rectangle-intersect-p + start-coordinates dimensions + point-to-paste-coordinates dimensions) + (not (< (car point-to-paste-coordinates) + (car start-coordinates))))) + (and (<= (overlay-start + (car mouse-drag-and-drop-overlays)) + point-to-paste) + (<= point-to-paste + (overlay-end + (car mouse-drag-and-drop-overlays)))))))) + + ;; Show a tooltip. + (if mouse-drag-and-drop-region-show-tooltip + ;; Don't use tooltip-show since it has side effects + ;; which change the text properties, and + ;; `text-tooltip' can potentially be the text which + ;; will be pasted. + (mouse-drag-and-drop-region-display-tooltip text-tooltip) + (mouse-drag-and-drop-region-hide-tooltip)) + + ;; Show cursor and highlight the original region. + (when mouse-drag-and-drop-region-show-cursor + ;; Modify cursor even when point is out of frame. + (setq cursor-type (cond + ((not cursor-in-text-area) + nil) + ((or point-to-paste-read-only + drag-but-negligible) + 'hollow) + (t + 'bar))) + (when cursor-in-text-area + (dolist (overlay mouse-drag-and-drop-overlays) + (overlay-put overlay + 'face 'mouse-drag-and-drop-region)) + (deactivate-mark) ; Maintain region in other window. + (mouse-set-point event))))))) ;; Hide a tooltip. - (when mouse-drag-and-drop-region-show-tooltip (tooltip-hide)) + (when mouse-drag-and-drop-region-show-tooltip (x-hide-tip)) ;; Check if modifier was pressed on drop. (setq no-modifier-on-drop |