#24: create new eraser when surface is completly redrawn (force=True)

pygame_vkeyboard/vkeyboard.py

@@ -591,13 +591,26 @@ def get_rect(self):
             rect = rect.union(self.input.get_rect())
         return rect
 
+    def set_eraser(self, surface):
+        """Setup the surface used to hide/clear the keyboard.
+        """
+        self.eraser = surface.copy()
+        for layout in self.layouts:
+            layout.sprites.clear(surface, self.eraser)
+
     def draw(self, surface=None, force=False):
         """Draw the virtual keyboard.
 
         This method is optimized to be called at each loop of the
         main application. It uses DirtySprite to update only parts
         of the screen that need to be refreshed.
 
+        The first call to this method will setup the "eraser" surface that
+        will be used to redraw dirty parts of the screen.
+
+        The `force` parameter shall be used if the surface has been redrawn:
+        it reset the eraser and redraw all sprites.
+
         Parameters
         ----------
         surface:
@@ -610,15 +623,22 @@ def draw(self, surface=None, force=False):
         rects:
             List of updated area.
         """
-        # Setup the surface used to hide/clear the keyboard
-        if surface and surface != self.eraser:
-            self.eraser = surface
-            for layout in self.layouts:
-                layout.sprites.clear(surface, self.eraser.copy())
+        surface = surface or self.surface
+
+        # Setup eraser
+        if not self.eraser or force:
+            self.set_eraser(surface)
+
+        # Setup new the surface where to draw
+        for layout in self.layouts:
+            if layout.sprites.get_clip() != self.background.rect:
+                # Changing the clipping area will force update of all
+                # sprites without using "dirty mechanism"
                 layout.sprites.set_clip(self.background.rect)
 
-        rects = self.layout.sprites.draw(surface or self.surface)
-        rects += self.input.draw(surface or self.surface, force)
+        rects = self.layout.sprites.draw(surface)
+        rects += self.input.draw(surface, force)
+
         if force:
             self.layout.sprites.repaint_rect(self.background.rect)
         return rects
@@ -631,7 +651,7 @@ def update(self, events):
         events:
             List of events to process.
         """
-        if self.state > 0:
+        if self.state == 1:
             self.layout.sprites.update(events)
             self.input.update(events)
 

pygame_vkeyboard/vtextinput.py

@@ -301,7 +301,7 @@ def is_enabled(self):
 
     def disable(self):
         """Set this text input as non active."""
-        self.state = 0
+        self.state = 0   # Disabled by default
         self.cursor.visible = 0
         self.background.visible = 0
         for line in self.sprites.get_sprites_from_layer(1):
@@ -323,6 +323,12 @@ def get_rect(self):
         """Return text input rect."""
         return self.background.rect
 
+    def set_eraser(self, surface):
+        """Setup the surface used to hide/clear the keyboard.
+        """
+        self.eraser = surface.copy()
+        self.sprites.clear(surface, self.eraser)
+
     def draw(self, surface, force):
         """Draw the text input box.
 
@@ -333,13 +339,18 @@ def draw(self, surface, force):
         force:
             Force the drawing of the entire surface (time consuming).
         """
-        # Setup the surface used to hide/clear the text input
-        if surface and surface != self.eraser:
-            self.eraser = surface
-            self.sprites.clear(surface, self.eraser.copy())
-            self.sprites.set_clip(pygame.Rect(self.position[0], 0,
-                                              self.size[0],
-                                              self.position[1] + self.size[1]))
+        # Setup eraser
+        if not self.eraser or force:
+            self.set_eraser(surface)
+
+        # Setup new the surface where to draw
+        clip_rect = pygame.Rect(self.position[0], 0,
+                                self.background.rect.width,
+                                self.background.rect.bottom)
+        if self.sprites.get_clip() != clip_rect:
+            # Changing the clipping area will force update of all
+            # sprites without using "dirty mechanism"
+            self.sprites.set_clip(clip_rect)
 
         if force:
             self.sprites.repaint_rect(self.background.rect)
@@ -353,7 +364,7 @@ def update(self, events):
         events:
             List of events to process.
         """
-        if self.state > 0:
+        if self.state == 1:
             self.sprites.update(events)
             for event in events:
                 if event.type == pygame.KEYUP and self.cursor.selected:
@@ -378,7 +389,7 @@ def update(self, events):
 
     def update_lines(self):
         """Update lines content with the current text."""
-        if self.state > 0:
+        if self.state == 1:
             remain = self.text
 
             # Update existing line with text