X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/1fded56b375bf7a4687af1cdb182899614c1b2a8..32485259c1342115488d219776dfebeb3d4d81b1:/wxPython/wx/lib/mixins/rubberband.py

diff --git a/wxPython/wx/lib/mixins/rubberband.py b/wxPython/wx/lib/mixins/rubberband.py
index de0614becf..454f8c9317 100644
--- a/wxPython/wx/lib/mixins/rubberband.py
+++ b/wxPython/wx/lib/mixins/rubberband.py
@@ -1,11 +1,406 @@
+#---------------------------------------------------------------------------
+# Name:        wxPython.lib.mixins.rubberband
+# Purpose:     A mixin class for doing "RubberBand"-ing on a window.
+#
+# Author:      Robb Shecter and members of wxPython-users
+#
+# Created:     11-September-2002
+# RCS-ID:      $Id$
+# Copyright:   (c) 2002 by db-X Corporation
+# Licence:     wxWindows license
+#---------------------------------------------------------------------------
+# 12/14/2003 - Jeff Grimmett (grimmtooth@softhome.net)
+#
+# o 2.5 compatability update.
+# o Tested, but there is an anomaly between first use and subsequent uses.
+#   First use is odd, subsequent uses seem to be OK. Init error?
+#   -- No, the first time it uses an aspect ratio, but after the reset it doesn't.
+#
 
-"""Renamer stub: provides a way to drop the wx prefix from wxPython objects."""
+"""
+A mixin class for doing "RubberBand"-ing on a window.
+"""
 
-__cvsid__ = "$Id$"
-__revision__ = "$Revision$"[11:-2]
+import  wx
 
-from wx import _rename
-from wxPython.lib.mixins import rubberband
-_rename(globals(), rubberband.__dict__, modulename='lib.mixins.rubberband')
-del rubberband
-del _rename
+#
+# Some miscellaneous mathematical and geometrical functions
+#
+
+def isNegative(aNumber):
+    """
+    x < 0:   1
+    else:    0
+    """
+    return aNumber < 0
+
+
+def normalizeBox(box):
+    """
+    Convert any negative measurements in the current
+    box to positive, and adjust the origin.
+    """
+    x, y, w, h = box
+    if w < 0:
+        x += (w+1)
+        w *= -1
+    if h < 0:
+        y += (h+1)
+        h *= -1
+    return (x, y, w, h)
+
+
+def boxToExtent(box):
+    """
+    Convert a box specification to an extent specification.
+    I put this into a seperate function after I realized that
+    I had been implementing it wrong in several places.
+    """
+    b = normalizeBox(box)
+    return (b[0], b[1], b[0]+b[2]-1, b[1]+b[3]-1)
+
+
+def pointInBox(x, y, box):
+    """
+    Return True if the given point is contained in the box.
+    """
+    e = boxToExtent(box)
+    return x >= e[0] and x <= e[2] and y >= e[1] and y <= e[3]
+
+
+def pointOnBox(x, y, box, thickness=1):
+    """
+    Return True if the point is on the outside edge
+    of the box.  The thickness defines how thick the
+    edge should be.  This is necessary for HCI reasons:
+    For example, it's normally very difficult for a user
+    to manuever the mouse onto a one pixel border.
+    """
+    outerBox = box
+    innerBox = (box[0]+thickness, box[1]+thickness, box[2]-(thickness*2), box[3]-(thickness*2))
+    return pointInBox(x, y, outerBox) and not pointInBox(x, y, innerBox)
+
+
+def getCursorPosition(x, y, box, thickness=1):
+    """
+    Return a position number in the range 0 .. 7 to indicate
+    where on the box border the point is.  The layout is:
+
+              0    1    2
+              7         3
+              6    5    4
+    """
+    x0, y0, x1, y1 = boxToExtent(box)
+    w, h  = box[2], box[3]
+    delta = thickness - 1
+    p     = None
+
+    if pointInBox(x, y, (x0, y0, thickness, thickness)):
+        p = 0
+    elif pointInBox(x, y, (x1-delta, y0, thickness, thickness)):
+        p = 2
+    elif pointInBox(x, y, (x1-delta, y1-delta, thickness, thickness)):
+        p = 4
+    elif pointInBox(x, y, (x0, y1-delta, thickness, thickness)):
+        p = 6
+    elif pointInBox(x, y, (x0+thickness, y0, w-(thickness*2), thickness)):
+        p = 1
+    elif pointInBox(x, y, (x1-delta, y0+thickness, thickness, h-(thickness*2))):
+        p = 3
+    elif pointInBox(x, y, (x0+thickness, y1-delta, w-(thickness*2), thickness)):
+        p = 5
+    elif pointInBox(x, y, (x0, y0+thickness, thickness, h-(thickness*2))):
+        p = 7
+
+    return p
+
+
+
+
+class RubberBand:
+    """
+    A stretchable border which is drawn on top of an
+    image to define an area.
+    """
+    def __init__(self, drawingSurface, aspectRatio=None):
+        self.__THICKNESS     = 5
+        self.drawingSurface  = drawingSurface
+        self.aspectRatio     = aspectRatio
+        self.hasLetUp        = 0
+        self.currentlyMoving = None
+        self.currentBox      = None
+        self.__enabled       = 1
+        self.__currentCursor = None
+
+        drawingSurface.Bind(wx.EVT_MOUSE_EVENTS, self.__handleMouseEvents)
+        drawingSurface.Bind(wx.EVT_PAINT, self.__handleOnPaint)
+
+    def __setEnabled(self, enabled):
+        self.__enabled = enabled
+
+    def __isEnabled(self):
+        return self.__enabled
+
+    def __handleOnPaint(self, event):
+        #print 'paint'
+        event.Skip()
+
+    def __isMovingCursor(self):
+        """
+        Return True if the current cursor is one used to
+        mean moving the rubberband.
+        """
+        return self.__currentCursor == wx.CURSOR_HAND
+
+    def __isSizingCursor(self):
+        """
+        Return True if the current cursor is one of the ones
+        I may use to signify sizing.
+        """
+        sizingCursors = [wx.CURSOR_SIZENESW,
+                         wx.CURSOR_SIZENS,
+                         wx.CURSOR_SIZENWSE,
+                         wx.CURSOR_SIZEWE,
+                         wx.CURSOR_SIZING,
+                         wx.CURSOR_CROSS]
+        try:
+            sizingCursors.index(self.__currentCursor)
+            return 1
+        except ValueError:
+            return 0
+
+
+    def __handleMouseEvents(self, event):
+        """
+        React according to the new event.  This is the main
+        entry point into the class.  This method contains the
+        logic for the class's behavior.
+        """
+        if not self.enabled:
+            return
+
+        x, y = event.GetPosition()
+
+        # First make sure we have started a box.
+        if self.currentBox == None and not event.LeftDown():
+            # No box started yet.  Set cursor to the initial kind.
+            self.__setCursor(wx.CURSOR_CROSS)
+            return
+
+        if event.LeftDown():
+            if self.currentBox == None:
+                # No RB Box, so start a new one.
+                self.currentBox = (x, y, 0, 0)
+                self.hasLetUp   = 0
+            elif self.__isSizingCursor():
+                # Starting a sizing operation.  Change the origin.
+                position = getCursorPosition(x, y, self.currentBox, thickness=self.__THICKNESS)
+                self.currentBox = self.__denormalizeBox(position, self.currentBox)
+
+        elif event.Dragging() and event.LeftIsDown():
+            # Use the cursor type to determine operation
+            if self.__isMovingCursor():
+                if self.currentlyMoving or pointInBox(x, y, self.currentBox):
+                    if not self.currentlyMoving:
+                        self.currentlyMoving = (x - self.currentBox[0], y - self.currentBox[1])
+                    self.__moveTo(x - self.currentlyMoving[0], y - self.currentlyMoving[1])
+            elif self.__isSizingCursor():
+                self.__resizeBox(x, y)
+
+        elif event.LeftUp():
+            self.hasLetUp = 1
+            self.currentlyMoving = None
+            self.__normalizeBox()
+
+        elif event.Moving() and not event.Dragging():
+            # Simple mouse movement event
+            self.__mouseMoved(x,y)
+
+    def __denormalizeBox(self, position, box):
+        x, y, w, h = box
+        b = box
+        if position == 2 or position == 3:
+            b = (x, y + (h-1), w, h * -1)
+        elif position == 0 or position == 1 or position == 7:
+            b = (x + (w-1), y + (h-1), w * -1, h * -1)
+        elif position == 6:
+            b = (x + (w-1), y, w * -1, h)
+        return b
+
+    def __resizeBox(self, x, y):
+        """
+        Resize and repaint the box based on the given mouse
+        coordinates.
+        """
+        # Implement the correct behavior for dragging a side
+        # of the box:  Only change one dimension.
+        if not self.aspectRatio:
+            if self.__currentCursor == wx.CURSOR_SIZENS:
+                x = None
+            elif self.__currentCursor == wx.CURSOR_SIZEWE:
+                y = None
+
+        x0,y0,w0,h0 = self.currentBox
+        currentExtent = boxToExtent(self.currentBox)
+        if x == None:
+            if w0 < 1:
+                w0 += 1
+            else:
+                w0 -= 1
+            x = x0 + w0
+        if y == None:
+            if h0 < 1:
+                h0 += 1
+            else:
+                h0 -= 1
+            y = y0 + h0
+        x1,y1 = x, y
+        w, h = abs(x1-x0)+1, abs(y1-y0)+1
+        if self.aspectRatio:
+            w = max(w, int(h * self.aspectRatio))
+            h = int(w / self.aspectRatio)
+        w *= [1,-1][isNegative(x1-x0)]
+        h *= [1,-1][isNegative(y1-y0)]
+        newbox = (x0, y0, w, h)
+        self.__drawAndErase(boxToDraw=normalizeBox(newbox), boxToErase=normalizeBox(self.currentBox))
+        self.currentBox = (x0, y0, w, h)
+
+    def __normalizeBox(self):
+        """
+        Convert any negative measurements in the current
+        box to positive, and adjust the origin.
+        """
+        self.currentBox = normalizeBox(self.currentBox)
+
+    def __mouseMoved(self, x, y):
+        """
+        Called when the mouse moved without any buttons pressed
+        or dragging being done.
+        """
+        # Are we on the bounding box?
+        if pointOnBox(x, y, self.currentBox, thickness=self.__THICKNESS):
+            position = getCursorPosition(x, y, self.currentBox, thickness=self.__THICKNESS)
+            cursor   = [
+                wx.CURSOR_SIZENWSE,
+                wx.CURSOR_SIZENS,
+                wx.CURSOR_SIZENESW,
+                wx.CURSOR_SIZEWE,
+                wx.CURSOR_SIZENWSE,
+                wx.CURSOR_SIZENS,
+                wx.CURSOR_SIZENESW,
+                wx.CURSOR_SIZEWE
+                ] [position]
+            self.__setCursor(cursor)
+        elif pointInBox(x, y, self.currentBox):
+            self.__setCursor(wx.CURSOR_HAND)
+        else:
+            self.__setCursor()
+
+    def __setCursor(self, id=None):
+        """
+        Set the mouse cursor to the given id.
+        """
+        if self.__currentCursor != id:  # Avoid redundant calls
+            if id:
+                self.drawingSurface.SetCursor(wx.StockCursor(id))
+            else:
+                self.drawingSurface.SetCursor(wx.NullCursor)
+            self.__currentCursor = id
+
+    def __moveCenterTo(self, x, y):
+        """
+        Move the rubber band so that its center is at (x,y).
+        """
+        x0, y0, w, h = self.currentBox
+        x2, y2 = x - (w/2), y - (h/2)
+        self.__moveTo(x2, y2)
+
+    def __moveTo(self, x, y):
+        """
+        Move the rubber band so that its origin is at (x,y).
+        """
+        newbox = (x, y, self.currentBox[2], self.currentBox[3])
+        self.__drawAndErase(boxToDraw=newbox, boxToErase=self.currentBox)
+        self.currentBox = newbox
+
+    def __drawAndErase(self, boxToDraw, boxToErase=None):
+        """
+        Draw one box shape and possibly erase another.
+        """
+        dc = wx.ClientDC(self.drawingSurface)
+        dc.BeginDrawing()
+        dc.SetPen(wx.Pen(wx.WHITE, 1, wx.DOT))
+        dc.SetBrush(wx.TRANSPARENT_BRUSH)
+        dc.SetLogicalFunction(wx.XOR)
+        if boxToErase:
+            r = wx.Rect(*boxToErase)
+            dc.DrawRectangleRect(r)
+
+        r = wx.Rect(*boxToDraw)
+        dc.DrawRectangleRect(r)
+        dc.EndDrawing()
+
+    def __dumpMouseEvent(self, event):
+        print 'Moving:          ',event.Moving()
+        print 'Dragging:        ',event.Dragging()
+        print 'LeftDown:        ',event.LeftDown()
+        print 'LeftisDown:      ',event.LeftIsDown()
+        print 'LeftUp:          ',event.LeftUp()
+        print 'Position:        ',event.GetPosition()
+        print 'x,y:             ',event.GetX(),event.GetY()
+        print
+
+
+    #
+    # The public API:
+    #
+
+    def reset(self, aspectRatio=None):
+        """
+        Clear the existing rubberband
+        """
+        self.currentBox   = None
+        self.aspectRatio  = aspectRatio
+        self.drawingSurface.Refresh()
+
+    def getCurrentExtent(self):
+        """
+        Return (x0, y0, x1, y1) or None if
+        no drawing has yet been done.
+        """
+        if not self.currentBox:
+            extent = None
+        else:
+            extent = boxToExtent(self.currentBox)
+        return extent
+
+    enabled = property(__isEnabled, __setEnabled, None, 'True if I am responding to mouse events')
+
+
+
+if __name__ == '__main__':
+    app   = wx.PySimpleApp()
+    frame = wx.Frame(None, -1, title='RubberBand Test', size=(300,300))
+
+    # Add a panel that the rubberband will work on.
+    panel = wx.Panel(frame, -1)
+    panel.SetBackgroundColour(wx.BLUE)
+
+    # Create the rubberband
+    frame.rubberBand = RubberBand(drawingSurface=panel)
+    frame.rubberBand.reset(aspectRatio=0.5)
+
+    # Add a button that creates a new rubberband
+    def __newRubberBand(event):
+        frame.rubberBand.reset()
+    button = wx.Button(frame, 100, 'Reset Rubberband')
+    frame.Bind(wx.EVT_BUTTON, __newRubberBand, button)
+
+    # Layout the frame
+    sizer = wx.BoxSizer(wx.VERTICAL)
+    sizer.Add(panel,  1, wx.EXPAND | wx.ALL, 5)
+    sizer.Add(button, 0, wx.ALIGN_CENTER | wx.ALL, 5)
+    frame.SetAutoLayout(1)
+    frame.SetSizer(sizer)
+    frame.Show(1)
+    app.MainLoop()