From e4b210d60772a784b78183e58f2840a0cf02e739 Mon Sep 17 00:00:00 2001
From: John Loehrlein <jloehrle@users.sourceforge.net>
Date: Fri, 23 Jan 2009 20:05:19 +0000
Subject: [PATCH] direct entry scroll, a virtual window for direct entries

---
 direct/src/gui/DirectEntryScroll.py | 114 ++++++++++++++++++++++++++++
 direct/src/gui/DirectGui.py         |   1 +
 direct/src/gui/DirectGuiGlobals.py  |   1 +
 3 files changed, 116 insertions(+)
 create mode 100644 direct/src/gui/DirectEntryScroll.py

diff --git a/direct/src/gui/DirectEntryScroll.py b/direct/src/gui/DirectEntryScroll.py
new file mode 100644
index 0000000000..6f4710d8cf
--- /dev/null
+++ b/direct/src/gui/DirectEntryScroll.py
@@ -0,0 +1,114 @@
+__all__ = ['DirectEntryScroll']
+
+from pandac.PandaModules import *
+import DirectGuiGlobals as DGG
+from DirectScrolledFrame import *
+from DirectFrame import *
+from DirectEntry import *
+
+class DirectEntryScroll(DirectFrame):
+    def __init__(self, entry, parent = None, **kw):
+        optiondefs = (
+            ('pgFunc',         PGVirtualFrame,      None),
+            ('relief', None, None),
+            ('clipSize',     (-1, 1, -1, 1),        self.setClipSize),
+            )
+        
+        self.defineoptions(kw, optiondefs)
+        DirectFrame.__init__(self, parent, **kw)
+        self.canvas = None
+        self.visXMin = 0.0
+        self.visXMax = 0.0
+        self.clipXMin = 0.0
+        self.clipXMax = 0.0
+        self.initialiseoptions(DirectEntryScroll)
+              
+        self.entry = entry
+        self.canvas = NodePath(self.guiItem.getCanvasNode())
+        self.entry.reparentTo(self.canvas)
+        self.canvas.setPos(0,0,0)
+        
+        self.entry.bind(DGG.CURSORMOVE,self.cursorMove)
+        
+        self.canvas.node().setBounds(OmniBoundingVolume())
+        self.canvas.node().setFinal(1)
+        self.resetCanvas()
+        
+        base.scroller = self
+        
+ 
+        
+    def cursorMove(self, cursorX, cursorY):
+        cursorX = self.entry.guiItem.getCursorX() * self.entry['text_scale'][0]
+        canvasX = self.canvas.getX()
+        visXMin = self.clipXMin - canvasX
+        visXMax = self.clipXMax - canvasX
+        visXCenter = (visXMin + visXMax) * 0.5
+        distanceToCenter = visXCenter - cursorX 
+        clipExtent = self.clipXMax - self.clipXMin
+        
+        entryExtent = self.entry['text_scale'][0] * self.entry['width']
+        entryWiggle = entryExtent - clipExtent
+        
+        if abs(distanceToCenter) > (clipExtent * 0.5):
+            self.moveToCenterCursor()
+        
+        
+    def moveToCenterCursor(self):
+        cursorX = self.entry.guiItem.getCursorX() * self.entry['text_scale'][0]
+        canvasX = self.canvas.getX()
+        visXMin = self.clipXMin - canvasX
+        visXMax = self.clipXMax - canvasX
+        visXCenter = (visXMin + visXMax) * 0.5
+        distanceToCenter = visXCenter - cursorX 
+        newX = canvasX + distanceToCenter
+        
+        clipExtent = self.clipXMax - self.clipXMin
+
+        entryExtent = self.entry['text_scale'][0] * self.entry['width']
+        entryWiggle = entryExtent - clipExtent
+        
+        if self.entry.guiItem.getCursorPosition() <= 0: #deals with the cursor jump bug
+            newX = 0.0
+        elif newX > 0.0:
+            newX = 0.0
+        elif newX < (-entryWiggle):
+            newX = -entryWiggle
+        
+        #print("CursorX %s CanvasX %s VisCenter %s Distance %s NewX %s Wiggle %s" % (cursorX, canvasX, visXCenter, distanceToCenter, newX, entryWiggle))
+        
+        self.canvas.setX(newX)
+        
+    def destroy(self):
+        # Destroy children of the canvas
+        for child in self.canvas.getChildren():
+            childGui = self.guiDict.get(child.getName())
+            if childGui:
+                childGui.destroy()
+            else:
+                parts = child.getName().split('-')
+                simpleChildGui = self.guiDict.get(parts[-1])
+                if simpleChildGui:
+                    simpleChildGui.destroy()
+        self.entry.destroy()
+        self.entry = None
+        DirectFrame.destroy(self)
+        
+    
+    def getCanvas(self):
+        return self.canvas
+    
+    def setClipSize(self):
+        self.guiItem.setClipFrame(self['clipSize'])
+        self.clipXMin = self['clipSize'][0]
+        self.clipXMax = self['clipSize'][1]
+        self.visXMin = self.clipXMin
+        self.visXMax = self.clipXMax
+        if self.canvas:
+            self.resetCanvas()
+        
+    def resetCanvas(self):
+        self.canvas.setPos(0,0,0)
+        
+        
+        
\ No newline at end of file
diff --git a/direct/src/gui/DirectGui.py b/direct/src/gui/DirectGui.py
index 6a528b7437..1d3c0636de 100644
--- a/direct/src/gui/DirectGui.py
+++ b/direct/src/gui/DirectGui.py
@@ -15,6 +15,7 @@ from OnscreenImage import *
 from DirectFrame import *
 from DirectButton import *
 from DirectEntry import *
+from DirectEntryScroll import *
 from DirectLabel import *
 from DirectScrolledList import *
 from DirectDialog import *
diff --git a/direct/src/gui/DirectGuiGlobals.py b/direct/src/gui/DirectGuiGlobals.py
index 91e868ea05..c60d8b31fe 100644
--- a/direct/src/gui/DirectGuiGlobals.py
+++ b/direct/src/gui/DirectGuiGlobals.py
@@ -74,6 +74,7 @@ ACCEPT = PGEntry.getAcceptPrefix() + KeyboardButton.enter().getName() + '-'
 ACCEPTFAILED = PGEntry.getAcceptFailedPrefix() + KeyboardButton.enter().getName() + '-'
 TYPE = PGEntry.getTypePrefix()
 ERASE = PGEntry.getErasePrefix()
+CURSORMOVE = PGEntry.getCursormovePrefix()
 # For DirectSlider and DirectScrollBar widgets
 ADJUST = PGSliderBar.getAdjustPrefix()