Differential D4291 Diff 13611 intern/ghost/intern/GHOST_BoundsTracker.cpp

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intern/ghost/intern/GHOST_BoundsTracker.cpp

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				/*
				* This program is free software; you can redistribute it and/or
				* modify it under the terms of the GNU General Public License
				* as published by the Free Software Foundation; either version 2
				* of the License, or (at your option) any later version.
				*
				* This program is distributed in the hope that it will be useful,
				* but WITHOUT ANY WARRANTY; without even the implied warranty of
				* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
				* GNU General Public License for more details.
				*
				* You should have received a copy of the GNU General Public License
				* along with this program; if not, write to the Free Software Foundation,
				* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
				*
				* The Original Code is Copyright (C) 2019 Blender Foundation.
				* All rights reserved.
				*/

				/** \file \ingroup GHOST
				*
				* Definition of GHOST_BoundsTracker class.
				*/
				brechtUnsubmitted Done Inline Actions What is a "bounds tracker"? Can you document this? Or can this just be part of `GHOST_Window` instead of a separate class? brecht: What is a "bounds tracker"? Can you document this? Or can this just be part of `GHOST_Window`…
				sobakasuAuthorUnsubmitted Done Inline Actions the bounds tracker code is only used for X11 and SDL. It could be put into GHOST_Window. I have added some more comments to that code. sobakasu: the bounds tracker code is only used for X11 and SDL. It could be put into GHOST_Window. I have…

				#include "GHOST_BoundsTracker.h"
				#include <cstdlib>

				#define MAX_WM_TRANSFORM 50

				GHOST_BoundsTracker::
				GHOST_BoundsTracker(void)
				{
				}

				/* Set bounds used in a create window operation */
				void
				GHOST_BoundsTracker::
				setCreateBounds(
				GHOST_TInt32 left,
				GHOST_TInt32 top,
				GHOST_TUns32 width,
				GHOST_TUns32 height)
				{
				m_rect_create.set(left, top, left + width, top + height);
				}

				/* Compute the transformation on client bounds made by the window manager.
				* This method should be called after the window has been created on window resize/move events.
				*/
				void
				GHOST_BoundsTracker::
				updateWmTransform(GHOST_Rect client_bounds)
				{
				if (!m_found_transform) {
				// determine the transformation made by the window manager
				m_transform_x = client_bounds.m_l - m_rect_create.m_l;
				m_transform_y = client_bounds.m_t - m_rect_create.m_t;

				// expect the window manager to only adjust the size slightly
				// to add a title bar and borders etc. If the transformation is
				// too large, ignore it.
				if (abs(m_transform_x) < MAX_WM_TRANSFORM &&
				abs(m_transform_y) < MAX_WM_TRANSFORM) {
				m_found_transform = true;
				}
				else {
				m_transform_x = m_transform_y = 0;
				}

				//printf("update wm transform: (%d,%d)\n", m_transform_x, m_transform_y);
				}
				}

				/* Convert the given client bounds to window bounds. The resulting bounds can be used to
				* create a window with the same size and position as the current window.
				*/
				void
				GHOST_BoundsTracker::
				clientToWindowBounds(GHOST_Rect &bounds) const
				{
				// unapply transformations made by window manager so that future calls
				// to createWindow create the same geometry.
				if (m_found_transform) {
				bounds.m_l -= m_transform_x;
				bounds.m_t -= m_transform_y;
				bounds.m_r -= m_transform_x;
				bounds.m_b -= m_transform_y;
				}
				}