#----------------------------------------------------------------------
# Name: wx.lib.splitter
# Purpose: A class similar to wx.SplitterWindow but that allows more
# than a single split
#
# Author: Robin Dunn
#
# Created: 9-June-2005
# RCS-ID: $Id: splitter.py 53375 2008-04-27 03:59:28Z RD $
# Copyright: (c) 2005 by Total Control Software
# Licence: wxWindows license
#----------------------------------------------------------------------
"""
This module provides the `MultiSplitterWindow` class, which is very
similar to the standard `wx.SplitterWindow` except it can be split
more than once.
"""
import wx
_RENDER_VER = (2,6,1,1)
#----------------------------------------------------------------------
class MultiSplitterWindow(wx.PyPanel):
"""
This class is very similar to `wx.SplitterWindow` except that it
allows for more than two windows and more than one sash. Many of
the same styles, constants, and methods behave the same as in
wx.SplitterWindow. The key differences are seen in the methods
that deal with the child windows managed by the splitter, and also
those that deal with the sash positions. In most cases you will
need to pass an index value to tell the class which window or sash
you are refering to.
The concept of the sash position is also different than in
wx.SplitterWindow. Since the wx.Splitterwindow has only one sash
you can think of it's position as either relative to the whole
splitter window, or as relative to the first window pane managed
by the splitter. Once there is more than one sash then the
distinciton between the two concepts needs to be clairified. I've
chosen to use the second definition, and sash positions are the
distance (either horizontally or vertically) from the origin of
the window just before the sash in the splitter stack.
NOTE: These things are not yet supported:
* Using negative sash positions to indicate a position offset
from the end.
* User controlled unsplitting (with double clicks on the sash
or dragging a sash until the pane size is zero.)
* Sash gravity
"""
def __init__(self, parent, id=-1,
pos = wx.DefaultPosition, size = wx.DefaultSize,
style = 0, name="multiSplitter"):
# always turn on tab traversal
style |= wx.TAB_TRAVERSAL
# and turn off any border styles
style &= ~wx.BORDER_MASK
style |= wx.BORDER_NONE
# initialize the base class
wx.PyPanel.__init__(self, parent, id, pos, size, style, name)
self.SetBackgroundStyle(wx.BG_STYLE_CUSTOM)
# initialize data members
self._windows = []
self._sashes = []
self._pending = {}
self._permitUnsplitAlways = self.HasFlag(wx.SP_PERMIT_UNSPLIT)
self._orient = wx.HORIZONTAL
self._dragMode = wx.SPLIT_DRAG_NONE
self._activeSash = -1
self._oldX = 0
self._oldY = 0
self._checkRequestedSashPosition = False
self._minimumPaneSize = 0
self._sashCursorWE = wx.StockCursor(wx.CURSOR_SIZEWE)
self._sashCursorNS = wx.StockCursor(wx.CURSOR_SIZENS)
self._sashTrackerPen = wx.Pen(wx.BLACK, 2, wx.SOLID)
self._needUpdating = False
self._isHot = False
# Bind event handlers
self.Bind(wx.EVT_PAINT, self._OnPaint)
self.Bind(wx.EVT_IDLE, self._OnIdle)
self.Bind(wx.EVT_SIZE, self._OnSize)
self.Bind(wx.EVT_MOUSE_EVENTS, self._OnMouse)
def SetOrientation(self, orient):
"""
Set whether the windows managed by the splitter will be
stacked vertically or horizontally. The default is
horizontal.
"""
assert orient in [ wx.VERTICAL, wx.HORIZONTAL ]
self._orient = orient
def GetOrientation(self):
"""
Returns the current orientation of the splitter, either
wx.VERTICAL or wx.HORIZONTAL.
"""
return self._orient
def SetMinimumPaneSize(self, minSize):
"""
Set the smallest size that any pane will be allowed to be
resized to.
"""
self._minimumPaneSize = minSize
def GetMinimumPaneSize(self):
"""
Returns the smallest allowed size for a window pane.
"""
return self._minimumPaneSize
def AppendWindow(self, window, sashPos=-1):
"""
Add a new window to the splitter at the right side or bottom
of the window stack. If sashPos is given then it is used to
size the new window.
"""
self.InsertWindow(len(self._windows), window, sashPos)
def InsertWindow(self, idx, window, sashPos=-1):
"""
Insert a new window into the splitter at the position given in
``idx``.
"""
assert window not in self._windows, "A window can only be in the splitter once!"
self._windows.insert(idx, window)
self._sashes.insert(idx, -1)
if not window.IsShown():
window.Show()
if sashPos != -1:
self._pending[window] = sashPos
self._checkRequestedSashPosition = False
self._SizeWindows()
def DetachWindow(self, window):
"""
Removes the window from the stack of windows managed by the
splitter. The window will still exist so you should `Hide` or
`Destroy` it as needed.
"""
assert window in self._windows, "Unknown window!"
idx = self._windows.index(window)
del self._windows[idx]
del self._sashes[idx]
self._SizeWindows()
def ReplaceWindow(self, oldWindow, newWindow):
"""
Replaces oldWindow (which is currently being managed by the
splitter) with newWindow. The oldWindow window will still
exist so you should `Hide` or `Destroy` it as needed.
"""
assert oldWindow in self._windows, "Unknown window!"
idx = self._windows.index(oldWindow)
self._windows[idx] = newWindow
if not newWindow.IsShown():
newWindow.Show()
self._SizeWindows()
def ExchangeWindows(self, window1, window2):
"""
Trade the positions in the splitter of the two windows.
"""
assert window1 in self._windows, "Unknown window!"
assert window2 in self._windows, "Unknown window!"
idx1 = self._windows.index(window1)
idx2 = self._windows.index(window2)
self._windows[idx1] = window2
self._windows[idx2] = window1
self._SizeWindows()
def GetWindow(self, idx):
"""
Returns the idx'th window being managed by the splitter.
"""
assert idx < len(self._windows)
return self._windows[idx]
def GetSashPosition(self, idx):
"""
Returns the position of the idx'th sash, measured from the
left/top of the window preceding the sash.
"""
assert idx < len(self._sashes)
return self._sashes[idx]
def SetSashPosition(self, idx, pos):
"""
Set the psition of the idx'th sash, measured from the left/top
of the window preceding the sash.
"""
assert idx < len(self._sashes)
self._sashes[idx] = pos
self._SizeWindows()
def SizeWindows(self):
"""
Reposition and size the windows managed by the splitter.
Useful when windows have been added/removed or when styles
have been changed.
"""
self._SizeWindows()
def DoGetBestSize(self):
"""
Overridden base class virtual. Determines the best size of
the control based on the best sizes of the child windows.
"""
best = wx.Size(0,0)
if not self._windows:
best = wx.Size(10,10)
sashsize = self._GetSashSize()
if self._orient == wx.HORIZONTAL:
for win in self._windows:
winbest = win.GetEffectiveMinSize()
best.width += max(self._minimumPaneSize, winbest.width)
best.height = max(best.height, winbest.height)
best.width += sashsize * (len(self._windows)-1)
else:
for win in self._windows:
winbest = win.GetEffectiveMinSize()
best.height += max(self._minimumPaneSize, winbest.height)
best.width = max(best.width, winbest.width)
best.height += sashsize * (len(self._windows)-1)
border = 2 * self._GetBorderSize()
best.width += border
best.height += border
return best
# -------------------------------------
# Event handlers
def _OnPaint(self, evt):
dc = wx.PaintDC(self)
self._DrawSash(dc)
def _OnSize(self, evt):
parent = wx.GetTopLevelParent(self)
if parent.IsIconized():
evt.Skip()
return
self._SizeWindows()
def _OnIdle(self, evt):
evt.Skip()
# if this is the first idle time after a sash position has
# potentially been set, allow _SizeWindows to check for a
# requested size.
if not self._checkRequestedSashPosition:
self._checkRequestedSashPosition = True
self._SizeWindows()
if self._needUpdating:
self._SizeWindows()
def _OnMouse(self, evt):
if self.HasFlag(wx.SP_NOSASH):
return
x, y = evt.GetPosition()
isLive = self.HasFlag(wx.SP_LIVE_UPDATE)
adjustNeighbor = evt.ShiftDown()
# LeftDown: set things up for dragging the sash
if evt.LeftDown() and self._SashHitTest(x, y) != -1:
self._activeSash = self._SashHitTest(x, y)
self._dragMode = wx.SPLIT_DRAG_DRAGGING
self.CaptureMouse()
self._SetResizeCursor()
if not isLive:
self._pendingPos = (self._sashes[self._activeSash],
self._sashes[self._activeSash+1])
self._DrawSashTracker(x, y)
self._oldX = x
self._oldY = y
return
# LeftUp: Finsish the drag
elif evt.LeftUp() and self._dragMode == wx.SPLIT_DRAG_DRAGGING:
self._dragMode = wx.SPLIT_DRAG_NONE
self.ReleaseMouse()
self.SetCursor(wx.STANDARD_CURSOR)
if not isLive:
# erase the old tracker
self._DrawSashTracker(self._oldX, self._oldY)
diff = self._GetMotionDiff(x, y)
# determine if we can change the position
if isLive:
oldPos1, oldPos2 = (self._sashes[self._activeSash],
self._sashes[self._activeSash+1])
else:
oldPos1, oldPos2 = self._pendingPos
newPos1, newPos2 = self._OnSashPositionChanging(self._activeSash,
oldPos1 + diff,
oldPos2 - diff,
adjustNeighbor)
if newPos1 == -1:
# the change was not allowed
return
# TODO: check for unsplit?
self._SetSashPositionAndNotify(self._activeSash, newPos1, newPos2, adjustNeighbor)
self._activeSash = -1
self._pendingPos = (-1, -1)
self._SizeWindows()
# Entering or Leaving a sash: Change the cursor
elif (evt.Moving() or evt.Leaving() or evt.Entering()) and self._dragMode == wx.SPLIT_DRAG_NONE:
if evt.Leaving() or self._SashHitTest(x, y) == -1:
self._OnLeaveSash()
else:
self._OnEnterSash()
# Dragging the sash
elif evt.Dragging() and self._dragMode == wx.SPLIT_DRAG_DRAGGING:
diff = self._GetMotionDiff(x, y)
if not diff:
return # mouse didn't move far enough
# determine if we can change the position
if isLive:
oldPos1, oldPos2 = (self._sashes[self._activeSash],
self._sashes[self._activeSash+1])
else:
oldPos1, oldPos2 = self._pendingPos
newPos1, newPos2 = self._OnSashPositionChanging(self._activeSash,
oldPos1 + diff,
oldPos2 - diff,
adjustNeighbor)
if newPos1 == -1:
# the change was not allowed
return
if newPos1 == self._sashes[self._activeSash]:
return # nothing was changed
if not isLive:
# erase the old tracker
self._DrawSashTracker(self._oldX, self._oldY)
if self._orient == wx.HORIZONTAL:
x = self._SashToCoord(self._activeSash, newPos1)
else:
y = self._SashToCoord(self._activeSash, newPos1)
# Remember old positions
self._oldX = x
self._oldY = y
if not isLive:
# draw a new tracker
self._pendingPos = (newPos1, newPos2)
self._DrawSashTracker(self._oldX, self._oldY)
else:
self._DoSetSashPosition(self._activeSash, newPos1, newPos2, adjustNeighbor)
self._needUpdating = True
# -------------------------------------
# Internal helpers
def _RedrawIfHotSensitive(self, isHot):
if not wx.VERSION >= _RENDER_VER:
return
if wx.RendererNative.Get().GetSplitterParams(self).isHotSensitive:
self._isHot = isHot
dc = wx.ClientDC(self)
self._DrawSash(dc)
def _OnEnterSash(self):
self._SetResizeCursor()
self._RedrawIfHotSensitive(True)
def _OnLeaveSash(self):
self.SetCursor(wx.STANDARD_CURSOR)
self._RedrawIfHotSensitive(False)
def _SetResizeCursor(self):
if self._orient == wx.HORIZONTAL:
self.SetCursor(self._sashCursorWE)
else:
self.SetCursor(self._sashCursorNS)
def _OnSashPositionChanging(self, idx, newPos1, newPos2, adjustNeighbor):
# TODO: check for possibility of unsplit (pane size becomes zero)
# make sure that minsizes are honored
newPos1, newPos2 = self._AdjustSashPosition(idx, newPos1, newPos2, adjustNeighbor)
# sanity check
if newPos1 <= 0:
newPos2 += newPos1
newPos1 = 0
# send the events
evt = MultiSplitterEvent(
wx.wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGING, self)
evt.SetSashIdx(idx)
evt.SetSashPosition(newPos1)
if not self._DoSendEvent(evt):
# the event handler vetoed the change
newPos1 = -1
else:
# or it might have changed the value
newPos1 = evt.GetSashPosition()
if adjustNeighbor and newPos1 != -1:
evt.SetSashIdx(idx+1)
evt.SetSashPosition(newPos2)
if not self._DoSendEvent(evt):
# the event handler vetoed the change
newPos2 = -1
else:
# or it might have changed the value
newPos2 = evt.GetSashPosition()
if newPos2 == -1:
newPos1 = -1
return (newPos1, newPos2)
def _AdjustSashPosition(self, idx, newPos1, newPos2=-1, adjustNeighbor=False):
total = newPos1 + newPos2
# these are the windows on either side of the sash
win1 = self._windows[idx]
win2 = self._windows[idx+1]
# make adjustments for window min sizes
minSize = self._GetWindowMin(win1)
if minSize == -1 or self._minimumPaneSize > minSize:
minSize = self._minimumPaneSize
minSize += self._GetBorderSize()
if newPos1 < minSize:
newPos1 = minSize
newPos2 = total - newPos1
if adjustNeighbor:
minSize = self._GetWindowMin(win2)
if minSize == -1 or self._minimumPaneSize > minSize:
minSize = self._minimumPaneSize
minSize += self._GetBorderSize()
if newPos2 < minSize:
newPos2 = minSize
newPos1 = total - newPos2
return (newPos1, newPos2)
def _DoSetSashPosition(self, idx, newPos1, newPos2=-1, adjustNeighbor=False):
newPos1, newPos2 = self._AdjustSashPosition(idx, newPos1, newPos2, adjustNeighbor)
if newPos1 == self._sashes[idx]:
return False
self._sashes[idx] = newPos1
if adjustNeighbor:
self._sashes[idx+1] = newPos2
return True
def _SetSashPositionAndNotify(self, idx, newPos1, newPos2=-1, adjustNeighbor=False):
# TODO: what is the thing about _requestedSashPosition for?
self._DoSetSashPosition(idx, newPos1, newPos2, adjustNeighbor)
evt = MultiSplitterEvent(
wx.wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGED, self)
evt.SetSashIdx(idx)
evt.SetSashPosition(newPos1)
self._DoSendEvent(evt)
if adjustNeighbor:
evt.SetSashIdx(idx+1)
evt.SetSashPosition(newPos2)
self._DoSendEvent(evt)
def _GetMotionDiff(self, x, y):
# find the diff from the old pos
if self._orient == wx.HORIZONTAL:
diff = x - self._oldX
else:
diff = y - self._oldY
return diff
def _SashToCoord(self, idx, sashPos):
coord = 0
for i in range(idx):
coord += self._sashes[i]
coord += self._GetSashSize()
coord += sashPos
return coord
def _GetWindowMin(self, window):
# NOTE: Should this use GetEffectiveMinSize?
if self._orient == wx.HORIZONTAL:
return window.GetMinWidth()
else:
return window.GetMinHeight()
def _GetSashSize(self):
if self.HasFlag(wx.SP_NOSASH):
return 0
if wx.VERSION >= _RENDER_VER:
return wx.RendererNative.Get().GetSplitterParams(self).widthSash
else:
return 5
def _GetBorderSize(self):
if wx.VERSION >= _RENDER_VER:
return wx.RendererNative.Get().GetSplitterParams(self).border
else:
return 0
def _DrawSash(self, dc):
if wx.VERSION >= _RENDER_VER:
if self.HasFlag(wx.SP_3DBORDER):
wx.RendererNative.Get().DrawSplitterBorder(
self, dc, self.GetClientRect())
# if there are no splits then we're done.
if len(self._windows) < 2:
return
# if we are not supposed to use a sash then we're done.
if self.HasFlag(wx.SP_NOSASH):
return
# Reverse the sense of the orientation, in this case it refers
# to the direction to draw the sash not the direction that
# windows are stacked.
orient = { wx.HORIZONTAL : wx.VERTICAL,
wx.VERTICAL : wx.HORIZONTAL }[self._orient]
flag = 0
if self._isHot:
flag = wx.CONTROL_CURRENT
pos = 0
for sash in self._sashes[:-1]:
pos += sash
if wx.VERSION >= _RENDER_VER:
wx.RendererNative.Get().DrawSplitterSash(self, dc,
self.GetClientSize(),
pos, orient, flag)
else:
dc.SetPen(wx.TRANSPARENT_PEN)
dc.SetBrush(wx.Brush(self.GetBackgroundColour()))
sashsize = self._GetSashSize()
if orient == wx.VERTICAL:
x = pos
y = 0
w = sashsize
h = self.GetClientSize().height
else:
x = 0
y = pos
w = self.GetClientSize().width
h = sashsize
dc.DrawRectangle(x, y, w, h)
pos += self._GetSashSize()
def _DrawSashTracker(self, x, y):
# Draw a line to represent the dragging sash, for when not
# doing live updates
w, h = self.GetClientSize()
dc = wx.ScreenDC()
if self._orient == wx.HORIZONTAL:
x1 = x
y1 = 2
x2 = x
y2 = h-2
if x1 > w:
x1 = w
x2 = w
elif x1 < 0:
x1 = 0
x2 = 0
else:
x1 = 2
y1 = y
x2 = w-2
y2 = y
if y1 > h:
y1 = h
y2 = h
elif y1 < 0:
y1 = 0
y2 = 0
x1, y1 = self.ClientToScreenXY(x1, y1)
x2, y2 = self.ClientToScreenXY(x2, y2)
dc.SetLogicalFunction(wx.INVERT)
dc.SetPen(self._sashTrackerPen)
dc.SetBrush(wx.TRANSPARENT_BRUSH)
dc.DrawLine(x1, y1, x2, y2)
dc.SetLogicalFunction(wx.COPY)
def _SashHitTest(self, x, y, tolerance=5):
# if there are no splits then we're done.
if len(self._windows) < 2:
return -1
if self._orient == wx.HORIZONTAL:
z = x
else:
z = y
pos = 0
for idx, sash in enumerate(self._sashes[:-1]):
pos += sash
hitMin = pos - tolerance
hitMax = pos + self._GetSashSize() + tolerance
if z >= hitMin and z <= hitMax:
return idx
pos += self._GetSashSize()
return -1
def _SizeWindows(self):
# no windows yet?
if not self._windows:
return
# are there any pending size settings?
for window, spos in self._pending.items():
idx = self._windows.index(window)
# TODO: this may need adjusted to make sure they all fit
# in the current client size
self._sashes[idx] = spos
del self._pending[window]
# are there any that still have a -1?
for idx, spos in enumerate(self._sashes[:-1]):
if spos == -1:
# TODO: this should also be adjusted
self._sashes[idx] = 100
cw, ch = self.GetClientSize()
border = self._GetBorderSize()
sash = self._GetSashSize()
if len(self._windows) == 1:
# there's only one, it's an easy layout
self._windows[0].SetDimensions(border, border,
cw - 2*border, ch - 2*border)
else:
if 'wxMSW' in wx.PlatformInfo:
self.Freeze()
if self._orient == wx.HORIZONTAL:
x = y = border
h = ch - 2*border
for idx, spos in enumerate(self._sashes[:-1]):
self._windows[idx].SetDimensions(x, y, spos, h)
x += spos + sash
# last one takes the rest of the space. TODO make this configurable
last = cw - 2*border - x
self._windows[idx+1].SetDimensions(x, y, last, h)
if last > 0:
self._sashes[idx+1] = last
else:
x = y = border
w = cw - 2*border
for idx, spos in enumerate(self._sashes[:-1]):
self._windows[idx].SetDimensions(x, y, w, spos)
y += spos + sash
# last one takes the rest of the space. TODO make this configurable
last = ch - 2*border - y
self._windows[idx+1].SetDimensions(x, y, w, last)
if last > 0:
self._sashes[idx+1] = last
if 'wxMSW' in wx.PlatformInfo:
self.Thaw()
self._DrawSash(wx.ClientDC(self))
self._needUpdating = False
def _DoSendEvent(self, evt):
return not self.GetEventHandler().ProcessEvent(evt) or evt.IsAllowed()
#----------------------------------------------------------------------
class MultiSplitterEvent(wx.PyCommandEvent):
"""
This event class is almost the same as `wx.SplitterEvent` except
it adds an accessor for the sash index that is being changed. The
same event type IDs and event binders are used as with
`wx.SplitterEvent`.
"""
def __init__(self, type=wx.wxEVT_NULL, splitter=None):
wx.PyCommandEvent.__init__(self, type)
if splitter:
self.SetEventObject(splitter)
self.SetId(splitter.GetId())
self.sashIdx = -1
self.sashPos = -1
self.isAllowed = True
def SetSashIdx(self, idx):
self.sashIdx = idx
def SetSashPosition(self, pos):
self.sashPos = pos
def GetSashIdx(self):
return self.sashIdx
def GetSashPosition(self):
return self.sashPos
# methods from wx.NotifyEvent
def Veto(self):
self.isAllowed = False
def Allow(self):
self.isAllowed = True
def IsAllowed(self):
return self.isAllowed
#----------------------------------------------------------------------
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