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grc: add middle mouse button panning

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Signed-off-by: vnydv21 <2021eeb1335@iitrpr.ac.in>
This commit is contained in:
vnydv21 2024-03-10 17:16:49 +05:30 committed by Jeff Long
parent 1327c1dc99
commit 89002ae738
1 changed files with 29 additions and 0 deletions
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29
gui/DrawingArea.py
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@ -39,6 +39,9 @@ class DrawingArea(Gtk.DrawingArea):
self.mod1_mask = False
self.button_state = [False] * 10
# middle mouse panning
self._old_mouse_coodinates = (0, 0)
# self.set_size_request(MIN_WINDOW_WIDTH, MIN_WINDOW_HEIGHT)
self.connect('realize', self._handle_window_realize)
self.connect('draw', self.draw)
@ -109,6 +112,27 @@ class DrawingArea(Gtk.DrawingArea):
self._update_after_zoom = True
self.queue_draw()
def _middle_mouse_pan(self, event):
"""
Pan the canvas with the middle mouse button.
"""
x, y = event.x, event.y
old_x, old_y = self._old_mouse_coodinates
scrollbox = self.get_parent().get_parent()
def scroll(dpos, adj):
adj_val = adj.get_value()
if abs(dpos) >= Constants.SCROLL_DISTANCE:
adj.set_value(adj_val - dpos)
adj.emit('changed')
dx = x - old_x
dy = y - old_y
scroll(dx, scrollbox.get_hadjustment())
scroll(dy, scrollbox.get_vadjustment())
def _handle_mouse_scroll(self, widget, event):
if event.get_state() & Gdk.ModifierType.CONTROL_MASK:
if event.direction == Gdk.ScrollDirection.UP:
@ -140,6 +164,9 @@ class DrawingArea(Gtk.DrawingArea):
coordinate=self._translate_event_coords(event),
event=event,
)
elif event.button == 2:
# middle mouse panning
self._old_mouse_coodinates = (event.x, event.y)
def _handle_mouse_button_release(self, widget, event):
"""
@ -162,6 +189,8 @@ class DrawingArea(Gtk.DrawingArea):
if self.button_state[1]:
self._auto_scroll(event)
elif self.button_state[2]:
self._middle_mouse_pan(event)
self._flow_graph.handle_mouse_motion(
coordinate=self._translate_event_coords(event),