protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int width = getPaddingLeft() + getPaddingRight() + mContent.getDesiredWidth();
int height =
getPaddingTop() + getPaddingBottom() + mContent.getDesiredHeight() + mFolderNameHeight;
int contentWidthSpec =
MeasureSpec.makeMeasureSpec(mContent.getDesiredWidth(), MeasureSpec.EXACTLY);
int contentHeightSpec =
MeasureSpec.makeMeasureSpec(mContent.getDesiredHeight(), MeasureSpec.EXACTLY);
mContent.measure(contentWidthSpec, contentHeightSpec);
mFolderName.measure(
contentWidthSpec, MeasureSpec.makeMeasureSpec(mFolderNameHeight, MeasureSpec.EXACTLY));
setMeasuredDimension(width, height);
}
private int getContentAreaHeight() {
LauncherAppState app = LauncherAppState.getInstance();
DeviceProfile grid = app.getDynamicGrid().getDeviceProfile();
Rect workspacePadding =
grid.getWorkspacePadding(grid.isLandscape ? CellLayout.LANDSCAPE : CellLayout.PORTRAIT);
int maxContentAreaHeight =
grid.availableHeightPx - workspacePadding.top - workspacePadding.bottom - mFolderNameHeight;
int height = Math.min(maxContentAreaHeight, mContent.getDesiredHeight());
return Math.max(height, MIN_CONTENT_DIMEN);
}
/** 以图标为中心，中心对齐，比如缩放时要以中心对齐 */
private void centerAboutIcon() {
DragLayer.LayoutParams lp = (DragLayer.LayoutParams) getLayoutParams();
int width = getPaddingLeft() + getPaddingRight() + mContent.getDesiredWidth();
int height =
getPaddingTop() + getPaddingBottom() + mContent.getDesiredHeight() + mFolderNameHeight;
DragLayer parent = (DragLayer) mLauncher.findViewById(R.id.drag_layer);
float scale = parent.getDescendantRectRelativeToSelf(mFolderIcon, mTempRect);
int centerX = (int) (mTempRect.left + mTempRect.width() * scale / 2);
int centerY = (int) (mTempRect.top + mTempRect.height() * scale / 2);
int centeredLeft = centerX - width / 2;
int centeredTop = centerY - height / 2;
int currentPage = mLauncher.getWorkspace().getCurrentPage();
// In case the workspace is scrolling, we need to use the final scroll
// to compute
// the folders bounds.
// 如果workspace正在滚动，就强制滚动到最后以计算最终的位置
mLauncher.getWorkspace().setFinalScrollForPageChange(currentPage);
// We first fetch the currently visible CellLayoutChildren
// 首先获取可见CellLayoutChildren
CellLayout currentLayout = (CellLayout) mLauncher.getWorkspace().getChildAt(currentPage);
ShortcutAndWidgetContainer boundingLayout = currentLayout.getShortcutsAndWidgets();
Rect bounds = new Rect();
parent.getDescendantRectRelativeToSelf(boundingLayout, bounds);
// We reset the workspaces scroll
// 强制重置workspace的滚动状态
mLauncher.getWorkspace().resetFinalScrollForPageChange(currentPage);
// 重新调整folder的边界，如果有需要的话，比如实际内容比folder要更大或者更小
int left = Math.min(Math.max(bounds.left, centeredLeft), bounds.left + bounds.width() - width);
int top = Math.min(Math.max(bounds.top, centeredTop), bounds.top + bounds.height() - height);
// 如果实际内容比folder要更大或者更小，那么调整为实际大小
if (width >= bounds.width()) {
left = bounds.left + (bounds.width() - width) / 2;
}
if (height >= bounds.height()) {
top = bounds.top + (bounds.height() - height) / 2;
}
int folderPivotX = width / 2 + (centeredLeft - left);
int folderPivotY = height / 2 + (centeredTop - top);
// 设置Folder的锚点
setPivotX(folderPivotX);
setPivotY(folderPivotY);
mFolderIconPivotX = (int) (mFolderIcon.getMeasuredWidth() * (1.0f * folderPivotX / width));
mFolderIconPivotY = (int) (mFolderIcon.getMeasuredHeight() * (1.0f * folderPivotY / height));
lp.width = width;
lp.height = height;
lp.x = left;
lp.y = top;
}
private void centerAboutIcon() {
DragLayer.LayoutParams lp = (DragLayer.LayoutParams) getLayoutParams();
int width = getPaddingLeft() + getPaddingRight() + mContent.getDesiredWidth();
int height =
getPaddingTop() + getPaddingBottom() + mContent.getDesiredHeight() + mFolderNameHeight;
DragLayer parent = (DragLayer) mLauncher.findViewById(R.id.drag_layer);
parent.getDescendantRectRelativeToSelf(mFolderIcon, mTempRect);
int centerX = mTempRect.centerX();
int centerY = mTempRect.centerY();
int centeredLeft = centerX - width / 2;
int centeredTop = centerY - height / 2;
// We first fetch the currently visible CellLayoutChildren
CellLayout currentPage = mLauncher.getWorkspace().getCurrentDropLayout();
CellLayoutChildren boundingLayout = currentPage.getChildrenLayout();
Rect bounds = new Rect();
parent.getDescendantRectRelativeToSelf(boundingLayout, bounds);
// We need to bound the folder to the currently visible CellLayoutChildren
int left = Math.min(Math.max(bounds.left, centeredLeft), bounds.left + bounds.width() - width);
int top = Math.min(Math.max(bounds.top, centeredTop), bounds.top + bounds.height() - height);
// If the folder doesn't fit within the bounds, center it about the desired bounds
if (width >= bounds.width()) {
left = bounds.left + (bounds.width() - width) / 2;
}
if (height >= bounds.height()) {
top = bounds.top + (bounds.height() - height) / 2;
}
int folderPivotX = width / 2 + (centeredLeft - left);
int folderPivotY = height / 2 + (centeredTop - top);
setPivotX(folderPivotX);
setPivotY(folderPivotY);
int folderIconPivotX = (int) (mFolderIcon.getMeasuredWidth() * (1.0f * folderPivotX / width));
int folderIconPivotY = (int) (mFolderIcon.getMeasuredHeight() * (1.0f * folderPivotY / height));
mFolderIcon.setPivotX(folderIconPivotX);
mFolderIcon.setPivotY(folderIconPivotY);
if (mMode == PARTIAL_GROW) {
lp.width = width;
lp.height = height;
lp.x = left;
lp.y = top;
} else {
mNewSize.set(left, top, left + width, top + height);
}
}
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int width = getPaddingLeft() + getPaddingRight() + mContent.getDesiredWidth();
int height = getFolderHeight();
int contentAreaWidthSpec =
MeasureSpec.makeMeasureSpec(getContentAreaWidth(), MeasureSpec.EXACTLY);
int contentAreaHeightSpec =
MeasureSpec.makeMeasureSpec(getContentAreaHeight(), MeasureSpec.EXACTLY);
if (LauncherAppState.isDisableAllApps() || mScrollingFolders) {
// Don't cap the height of the content to allow scrolling.
mContent.setFixedSize(getContentAreaWidth(), mContent.getDesiredHeight());
} else {
mContent.setFixedSize(getContentAreaWidth(), getContentAreaHeight());
}
mScrollView.measure(contentAreaWidthSpec, contentAreaHeightSpec);
mFolderName.measure(
contentAreaWidthSpec, MeasureSpec.makeMeasureSpec(mFolderNameHeight, MeasureSpec.EXACTLY));
setMeasuredDimension(width, height);
}