1 /* 2 * Copyright (C) 2024 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.launcher3.widget.util; 18 19 import static com.android.launcher3.widget.util.WidgetSizes.getWidgetSizePx; 20 21 import android.content.Context; 22 import android.util.Size; 23 24 import androidx.annotation.Px; 25 26 import com.android.launcher3.DeviceProfile; 27 import com.android.launcher3.R; 28 import com.android.launcher3.model.data.ItemInfo; 29 30 /** Utility classes to evaluate widget scale during drag and drops. **/ 31 public final class WidgetDragScaleUtils { 32 // Widgets are 5% scaled down relative to their size to have shadow display well inside the 33 // drop target frame (if its possible to scale it down within visible area under the finger). 34 private static final float WIDGET_SCALE_DOWN = 0.05f; 35 36 /** 37 * Returns the scale to be applied to given dragged view to scale it down relative to the 38 * spring loaded workspace. Applies additional scale down offset to get it a little inside 39 * the drop target frame. If the relative scale is smaller than minimum size needed to keep the 40 * view visible under the finger, scale down is performed only until the minimum size. 41 */ 42 @Px getWidgetDragScalePx(Context context, DeviceProfile deviceProfile, @Px float draggedViewWidthPx, @Px float draggedViewHeightPx, ItemInfo itemInfo)43 public static float getWidgetDragScalePx(Context context, DeviceProfile deviceProfile, 44 @Px float draggedViewWidthPx, @Px float draggedViewHeightPx, ItemInfo itemInfo) { 45 int minSize = context.getResources().getDimensionPixelSize( 46 R.dimen.widget_drag_view_min_scale_down_size); 47 Size widgetSizesPx = getWidgetSizePx(deviceProfile, itemInfo.spanX, itemInfo.spanY); 48 49 // We add workspace spring load scale, since the widget's drop target is also scaled, so 50 // the widget size is essentially that smaller. 51 float desiredWidgetScale = deviceProfile.getWorkspaceSpringLoadScale(context) 52 - WIDGET_SCALE_DOWN; 53 float desiredWidgetWidthPx = Math.max(minSize, 54 (desiredWidgetScale * widgetSizesPx.getWidth())); 55 float desiredWidgetHeightPx = Math.max(minSize, 56 desiredWidgetScale * widgetSizesPx.getHeight()); 57 58 final float bitmapAspectRatio = draggedViewWidthPx / draggedViewHeightPx; 59 final float containerAspectRatio = desiredWidgetWidthPx / desiredWidgetHeightPx; 60 61 // This downscales large views to fit inside drop target frame. Smaller drawable views may 62 // be up-scaled if they are smaller than the min size; 63 final float scale = bitmapAspectRatio >= containerAspectRatio ? desiredWidgetWidthPx 64 / draggedViewWidthPx : desiredWidgetHeightPx / draggedViewHeightPx; 65 // scale in terms of dp to be applied to the drag shadow during drag and drop 66 return (draggedViewWidthPx * scale) - draggedViewWidthPx; 67 } 68 } 69