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// MinOverlapPlacement.cc
// Copyright (c) 2007 Fluxbox Team (fluxgen at fluxbox dot org)
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR (*it)
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR (*it)WISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR (*it)
// DEALINGS IN THE SOFTWARE.
// $Id$
#include "MinOverlapPlacement.hh"
#include "Window.hh"
#include "Screen.hh"
ScreenPlacement::PlacementPolicy MinOverlapPlacement::s_policy = ScreenPlacement::ROWMINOVERLAPPLACEMENT;
ScreenPlacement::RowDirection MinOverlapPlacement::s_row_dir = ScreenPlacement::LEFTRIGHT;
ScreenPlacement::ColumnDirection MinOverlapPlacement::s_col_dir = ScreenPlacement::TOPBOTTOM;
MinOverlapPlacement::MinOverlapPlacement(ScreenPlacement::PlacementPolicy policy) {
s_policy = policy;
}
bool MinOverlapPlacement::placeWindow(
const std::list<FluxboxWindow *> &windowlist,
const FluxboxWindow &win, int &place_x, int &place_y) {
// view (screen + head) constraints
int head = (signed) win.getOnHead();
int head_left = (signed) win.screen().maxLeft(head);
int head_right = (signed) win.screen().maxRight(head);
int head_top = (signed) win.screen().maxTop(head);
int head_bot = (signed) win.screen().maxBottom(head);
const ScreenPlacement &screen_placement =
dynamic_cast<const ScreenPlacement &>(win.screen().placementStrategy());
s_row_dir = screen_placement.rowDirection();
s_col_dir = screen_placement.colDirection();
int win_w = win.width() + win.fbWindow().borderWidth()*2 + win.widthOffset();
int win_h = win.height() + win.fbWindow().borderWidth()*2 + win.heightOffset();
// we keep a set of open spaces on the desktop, sorted by size/location
std::set<Region> region_set;
// initialize the set of regions to contain the entire head
region_set.insert(Region(Region::TOPLEFT, head_left, head_top));
region_set.insert(Region(Region::TOPRIGHT, head_right - win_w, head_top));
region_set.insert(Region(Region::BOTTOMLEFT, head_left, head_bot - win_h));
region_set.insert(Region(Region::BOTTOMRIGHT, head_right - win_w,
head_bot - win_h));
// go through the list of windows, creating other reasonable placements
// at the end, we'll find the one with minimum overlap
// the size of this set is at most 2(n+2)(n+1) (n = number of windows)
// finding overlaps is therefore O(n^3), but it can probably be improved
std::list<FluxboxWindow *>::const_reverse_iterator it = windowlist.rbegin(),
it_end = windowlist.rend();
for (; it != it_end; ++it) {
// get the dimensions of the window
int left = (*it)->x() - (*it)->xOffset();
int top = (*it)->y() - (*it)->yOffset();
int right = left + (*it)->width() +
2*(*it)->frame().window().borderWidth() +
(*it)->widthOffset();
int bottom = top + (*it)->height() +
2*(*it)->frame().window().borderWidth() +
(*it)->heightOffset();
// go through the list of regions
// if this window overlaps that region and the new window still fits,
// it will create new regions to test
std::set<Region>::iterator reg_it = region_set.begin();
for (; reg_it != region_set.end(); ++reg_it) {
switch (reg_it->corner) {
case Region::TOPLEFT:
if (right > reg_it->x && bottom > reg_it->y) {
if (bottom + win_h <= head_bot)
region_set.insert(Region(Region::TOPLEFT,
reg_it->x, bottom));
if (right + win_w <= head_right)
region_set.insert(Region(Region::TOPLEFT,
right, reg_it->y));
}
break;
case Region::TOPRIGHT:
if (left < reg_it->x + win_w && bottom > reg_it->y) {
if (bottom + win_h <= head_bot)
region_set.insert(Region(Region::TOPRIGHT,
reg_it->x, bottom));
if (left - win_w >= head_left)
region_set.insert(Region(Region::TOPRIGHT,
left - win_w, reg_it->y));
}
break;
case Region::BOTTOMRIGHT:
if (left < reg_it->x + win_w && top < reg_it->y + win_h) {
if (top - win_h >= head_top)
region_set.insert(Region(Region::BOTTOMRIGHT,
reg_it->x, top - win_h));
if (left - win_w >= head_left)
region_set.insert(Region(Region::BOTTOMRIGHT,
left - win_w, reg_it->y));
}
break;
case Region::BOTTOMLEFT:
if (right > reg_it->x && top < reg_it->y + win_h) {
if (top - win_h >= head_top)
region_set.insert(Region(Region::BOTTOMLEFT,
reg_it->x, top - win_h));
if (right + win_w <= head_right)
region_set.insert(Region(Region::BOTTOMLEFT,
right, reg_it->y));
}
break;
}
}
}
// choose the region with minimum overlap
int min_so_far = win_w * win_h * windowlist.size() + 1;
std::set<Region>::iterator min_reg = region_set.end();
std::set<Region>::iterator reg_it = region_set.begin();
for (; reg_it != region_set.end(); ++reg_it) {
int overlap = 0;
it = windowlist.rbegin();
for (; it != windowlist.rend(); ++it) {
// get the dimensions of the window
int left = (*it)->x() - (*it)->xOffset();
int top = (*it)->y() - (*it)->yOffset();
int right = left + (*it)->width() +
2*(*it)->frame().window().borderWidth() +
(*it)->widthOffset();
int bottom = top + (*it)->height() +
2*(*it)->frame().window().borderWidth() +
(*it)->heightOffset();
// get the coordinates of the overlap region
int min_right = (right > reg_it->x + win_w) ?
reg_it->x + win_w : right;
int min_bottom = (bottom > reg_it->y + win_h) ?
reg_it->y + win_h : bottom;
int max_left = (left > reg_it->x) ? left : reg_it->x;
int max_top = (top > reg_it->y) ? top : reg_it->y;
// now compute the overlap and add to running total
if (min_right > max_left && min_bottom > max_top)
overlap += (min_right - max_left) * (min_bottom - max_top);
}
// if this placement is better, use it
if (overlap < min_so_far) {
min_reg = reg_it;
min_so_far = overlap;
if (overlap == 0) // can't do better than this
break;
}
}
// place window
place_x = min_reg->x + win.xOffset();
place_y = min_reg->y + win.yOffset();
return true;
}
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