Use less HW layers in All Apps

(saves memory) Change-Id: Ib2beda7549662a787437c7aa043e7858357c051f
2013-01-14 12:42:27 +01:00
parent ffc9f488a3
commit 47639b9c1d
4 changed files with 50 additions and 26 deletions
@@ -1099,7 +1099,7 @@ public class AppsCustomizePagedView extends PagedViewWithDraggableItems implemen
            images.add(info.iconBitmap);
        }

-        layout.createHardwareLayers();
+        enableHwLayersOnVisiblePages();
    }

    /**
@@ -1552,8 +1552,7 @@ public class AppsCustomizePagedView extends PagedViewWithDraggableItems implemen
                }
            }

-            layout.createHardwareLayer();
-            invalidate();
+            enableHwLayersOnVisiblePages();

            // Update all thread priorities
            Iterator<AppsCustomizeAsyncTask> iter = mRunningTasks.iterator();
@@ -1676,6 +1675,50 @@ public class AppsCustomizePagedView extends PagedViewWithDraggableItems implemen
                }
            }
        }
+
+        enableHwLayersOnVisiblePages();
+    }
+
+    private void enableHwLayersOnVisiblePages() {
+        final int screenCount = getChildCount();
+
+        getVisiblePages(mTempVisiblePagesRange);
+        int leftScreen = mTempVisiblePagesRange[0];
+        int rightScreen = mTempVisiblePagesRange[1];
+        int forceDrawScreen = -1;
+        if (leftScreen == rightScreen) {
+            // make sure we're caching at least two pages always
+            if (rightScreen < screenCount - 1) {
+                rightScreen++;
+                forceDrawScreen = rightScreen;
+            } else if (leftScreen > 0) {
+                leftScreen--;
+                forceDrawScreen = leftScreen;
+            }
+        } else {
+            forceDrawScreen = leftScreen + 1;
+        }
+
+        for (int i = 0; i < screenCount; i++) {
+            final View layout = (View) getPageAt(i);
+            if (!(leftScreen <= i && i <= rightScreen &&
+                    (i == forceDrawScreen || shouldDrawChild(layout)))) {
+                layout.setLayerType(LAYER_TYPE_NONE, null);
+            }
+        }
+
+        int newLeft = -1;
+        int newRight = -1;
+        for (int i = 0; i < screenCount; i++) {
+            final View layout = (View) getPageAt(i);
+
+            if (leftScreen <= i && i <= rightScreen &&
+                    (i == forceDrawScreen || shouldDrawChild(layout))) {
+                if (layout.getLayerType() != LAYER_TYPE_HARDWARE) {
+                    layout.setLayerType(LAYER_TYPE_HARDWARE, null);
+                }
+            }
+        }
    }

    protected void overScroll(float amount) {