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#------------------------------------------------------------------------------
# Copyright (c) 2008, Riverbank Computing Limited
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license.
#
# Author: Riverbank Computing Limited
# Description: <Enthought enable package component>
#
# In an e-mail to enthought-dev on 2008.09.12 at 2:49 AM CDT, Phil Thompson said:
# The advantage is that all of the PyQt code in ETS can now be re-licensed to
# use the BSD - and I hereby give my permission for that to be done. It's
# been on my list of things to do.
#------------------------------------------------------------------------------
# Qt imports.
from PyQt4 import QtCore, QtGui
# Enthought library imports.
from enthought.enable.abstract_window import AbstractWindow
from enthought.enable.events import KeyEvent, MouseEvent
from enthought.enable.graphics_context import GraphicsContextEnable
from enthought.traits.api import Instance
# Local imports.
from constants import BUTTON_NAME_MAP, KEY_MAP, POINTER_MAP
class _QtWindow(QtGui.QWidget):
""" The Qt widget that implements the enable control. """
def __init__(self, enable_window, parent):
QtGui.QWidget.__init__(self)
self._enable_window = enable_window
pos = self.mapFromGlobal(QtGui.QCursor.pos())
self.last_mouse_pos = (pos.x(), pos.y())
self.setAttribute(QtCore.Qt.WA_OpaquePaintEvent)
self.setFocusPolicy(QtCore.Qt.WheelFocus)
self.setMouseTracking(True)
self.setSizePolicy(QtGui.QSizePolicy.Expanding,
QtGui.QSizePolicy.Expanding)
def paintEvent(self, event):
self._enable_window._paint(event)
def resizeEvent(self, event):
dx = self.width()
dy = self.height()
self._enable_window.resized = (dx, dy)
component = self._enable_window.component
if hasattr(component, "fit_window") and component.fit_window:
component.outer_position = [0, 0]
component.outer_bounds = [dx, dy]
elif hasattr(component, "resizable"):
if "h" in component.resizable:
component.outer_x = 0
component.outer_width = dx
if "v" in component.resizable:
component.outer_y = 0
component.outer_height = dy
def closeEvent(self, event):
if self._enable_window.component is not None:
self._enable_window.component.cleanup(self)
self._enable_window.component.parent = None
self._enable_window.component.window = None
self._enable_window.component = None
self._enable_window.control = None
def keyReleaseEvent(self, event):
focus_owner = self._enable_window.focus_owner
if focus_owner is None:
focus_owner = self._enable_window.component
if focus_owner is None:
event.ignore()
return
# Convert the keypress to a standard enable key if possible, otherwise
# to text.
key = KEY_MAP.get(event.key())
if key is None:
key = unicode(event.text())
if not key:
return
# Use the last-seen mouse position as the coordinates of this event.
x, y = self.last_mouse_pos
modifiers = event.modifiers()
enable_event = KeyEvent(character=key, x=x,
y=self._enable_window._flip_y(y),
alt_down=bool(modifiers & QtCore.Qt.AltModifier),
shift_down=bool(modifiers & QtCore.Qt.ShiftModifier),
control_down=bool(modifiers & QtCore.Qt.ControlModifier),
event=event,
window=self._enable_window)
focus_owner.dispatch(enable_event, "key_pressed")
#------------------------------------------------------------------------
# Qt Mouse event handlers
#------------------------------------------------------------------------
def enterEvent(self, event):
self._enable_window._handle_mouse_event("mouse_enter", event)
def leaveEvent(self, event):
self._enable_window._handle_mouse_event("mouse_leave", event)
def mouseDoubleClickEvent(self, event):
name = BUTTON_NAME_MAP[event.button()]
self._enable_window._handle_mouse_event(name + "_dclick", event)
def mouseMoveEvent(self, event):
self._enable_window._handle_mouse_event("mouse_move", event)
def mousePressEvent(self, event):
name = BUTTON_NAME_MAP[event.button()]
self._enable_window._handle_mouse_event(name + "_down", event)
def mouseReleaseEvent(self, event):
name = BUTTON_NAME_MAP[event.button()]
self._enable_window._handle_mouse_event(name + "_up", event)
def wheelEvent(self, event):
self._enable_window._handle_mouse_event("mouse_wheel", event)
class Window(AbstractWindow):
control = Instance(_QtWindow)
def __init__(self, parent, wid=-1, pos=None, size=None, **traits):
AbstractWindow.__init__(self, **traits)
self._mouse_captured = False
self.control = _QtWindow(self, parent)
if pos is not None:
self.control.move(*pos)
if size is not None:
self.control.resize(*size)
#------------------------------------------------------------------------
# Qt Drag and drop event handlers
#------------------------------------------------------------------------
def dragEnterEvent(self, event):
pass
def dragLeaveEvent(self, event):
pass
def dragMoveEvent(self, event):
pass
def dropEvent(self, event):
pass
#------------------------------------------------------------------------
# Implementations of abstract methods in AbstractWindow
#------------------------------------------------------------------------
def set_drag_result(self, result):
# FIXME
print "In set_drag_result()"
raise NotImplementedError
def _capture_mouse ( self ):
"Capture all future mouse events"
# Nothing needed with Qt.
pass
def _release_mouse ( self ):
"Release the mouse capture"
# Nothing needed with Qt.
pass
def _create_mouse_event(self, event):
# If the event (if there is one) doesn't contain the mouse position,
# modifiers and buttons then get sensible defaults.
try:
x = event.x()
y = event.y()
modifiers = event.modifiers()
buttons = event.buttons()
except AttributeError:
pos = self.control.mapFromGlobal(QtGui.QCursor.pos())
x = pos.x()
y = pos.y()
modifiers = 0
buttons = 0
self.control.last_mouse_pos = (x, y)
# A bit crap, because AbstractWindow was written with wx in mind, and
# we treat wheel events like mouse events.
if isinstance(event, QtGui.QWheelEvent):
delta = event.delta()
degrees_per_step = 15.0
mouse_wheel = delta / float(8 * degrees_per_step)
else:
mouse_wheel = 0
return MouseEvent(x=x, y=self._flip_y(y), mouse_wheel=mouse_wheel,
alt_down=bool(modifiers & QtCore.Qt.AltModifier),
shift_down=bool(modifiers & QtCore.Qt.ShiftModifier),
control_down=bool(modifiers & QtCore.Qt.ControlModifier),
left_down=bool(buttons & QtCore.Qt.LeftButton),
middle_down=bool(buttons & QtCore.Qt.MidButton),
right_down=bool(buttons & QtCore.Qt.RightButton),
window=self)
def _redraw(self, coordinates=None):
if self.control:
if coordinates is None:
self.control.update()
else:
self.control.update(*coordinates)
def _get_control_size(self):
if self.control:
return (self.control.width(), self.control.height())
return None
# FIXME
#def _create_gc(self, size, pix_format="bgr24"):
def _create_gc(self, size, pix_format="bgra32"):
gc = GraphicsContextEnable((size[0]+1, size[1]+1),
pix_format=pix_format, window=self,
# We have to set bottom_up=0 or otherwise the PixelMap will
# appear upside down in the QImage.
bottom_up = 0)
gc.translate_ctm(0.5, 0.5)
return gc
def _window_paint(self, event):
s = self._gc.pixel_map.convert_to_argb32string()
img = QtGui.QImage(s, self._gc.width(), self._gc.height(),
QtGui.QImage.Format_ARGB32)
p = QtGui.QPainter(self.control)
p.drawPixmap(0, 0, QtGui.QPixmap.fromImage(img))
def set_pointer(self, pointer):
self.control.setCursor(POINTER_MAP[pointer])
def _set_timer_interval(self, component, interval):
# FIXME
print "In _set_timer_interval()"
raise NotImplementedError
def set_tooltip(self, tooltip):
self.control.setToolTip(tooltip)
def _set_focus(self):
self.control.setFocus()
#------------------------------------------------------------------------
# Private methods
#------------------------------------------------------------------------
def _flip_y(self, y):
"Converts between a Kiva and a Qt y coordinate"
return int(self._size[1] - y - 1)
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