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Use keypresses for fine adjustment of selection rect

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This commit is contained in:
Kovid Goyal 2013-12-04 13:55:16 +05:30
parent a83476cea8
commit 543a33bc63
1 changed files with 31 additions and 12 deletions
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29
src/calibre/gui2/tweak_book/editor/image.py
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@ -108,6 +108,7 @@ class Canvas(QWidget):
def __init__(self, parent=None):
QWidget.__init__(self, parent)
self.setMouseTracking(True)
self.setFocusPolicy(Qt.ClickFocus)
self.selection_state = SelectionState()
self.undo_stack = QUndoStack()
self.undo_stack.setUndoLimit(10)
@ -212,21 +213,24 @@ class Canvas(QWidget):
maxv = sr.bottom() - buf if edge == 'top' else self.target.bottom()
func(max(minv, min(maxv, delta + getattr(sr, edge)())))
def move_selection(self, dp):
def move_selection_rect(self, x, y):
sr = self.selection_state.rect
dm = self.selection_state.dragging
if dm is None:
half_width = sr.width() / 2.0
half_height = sr.height() / 2.0
c = sr.center()
nx = c.x() + dp.x()
ny = c.y() + dp.y()
nx = c.x() + x
ny = c.y() + y
minx = self.target.left() + half_width
maxx = self.target.right() - half_width
miny, maxy = self.target.top() + half_height, self.target.bottom() - half_height
nx = max(minx, min(maxx, nx))
ny = max(miny, min(maxy, ny))
sr.moveCenter(QPointF(nx, ny))
def move_selection(self, dp):
dm = self.selection_state.dragging
if dm is None:
self.move_selection_rect(dp.x(), dp.y())
else:
for edge in dm:
if edge is not None:
@ -302,6 +306,21 @@ class Canvas(QWidget):
self.update()
# }}}
def keyPressEvent(self, ev):
k = ev.key()
if k in (Qt.Key_Left, Qt.Key_Right, Qt.Key_Up, Qt.Key_Down) and self.has_selection:
ev.accept()
delta = 10 if ev.modifiers() & Qt.ShiftModifier else 1
x = y = 0
if k in (Qt.Key_Left, Qt.Key_Right):
x = delta * (-1 if k == Qt.Key_Left else 1)
else:
y = delta * (-1 if k == Qt.Key_Up else 1)
self.move_selection_rect(x, y)
self.update()
else:
return QWidget.keyPressEvent(self, ev)
# Painting {{{
@painter
def draw_background(self, painter):