1# ************************************************************* 2# 3# Licensed to the Apache Software Foundation (ASF) under one 4# or more contributor license agreements. See the NOTICE file 5# distributed with this work for additional information 6# regarding copyright ownership. The ASF licenses this file 7# to you under the Apache License, Version 2.0 (the 8# "License"); you may not use this file except in compliance 9# with the License. You may obtain a copy of the License at 10# 11# http://www.apache.org/licenses/LICENSE-2.0 12# 13# Unless required by applicable law or agreed to in writing, 14# software distributed under the License is distributed on an 15# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16# KIND, either express or implied. See the License for the 17# specific language governing permissions and limitations 18# under the License. 19# 20# ************************************************************* 21 22VCL positioning 23 24Window coordinates are parent relative, with exception of maState fields, they 25have screen coordinates. 26 27Every window has a parent window, usually the client area of an existing window, 28otherwise the desktop window. 29 30When a window is to be sized/moved, SetPosSize is called. 31Since coordinates are the position/size of client area, we need to calculate 32current window frame size/position and map to screen coordinates using the 33owner window position as offset. 34