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xdg-shell: make xdg-positioner flip target greatest available space (#7209) 

When both flip directions use more space than is available, pick the
direction that has more space available instead of just the opposite
of what was initially requested.
This commit is contained in:
outfoxxed 2024-08-07 04:26:09 -07:00 committed by GitHub
parent 3d82d199f0
commit b2717cf7fd
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1 changed files with 62 additions and 31 deletions
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89
src/protocols/XDGShell.cpp
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@ -533,27 +533,64 @@ CBox CXDGPositionerRules::getPosition(CBox constraint, const Vector2D& parentCoo
auto width = state.requestedSize.x;
auto height = state.requestedSize.y;
auto gravity = state.gravity;
auto anchorX = state.anchor.left() ? anchorRect.x : state.anchor.right() ? anchorRect.extent().x : anchorRect.middle().x;
auto anchorY = state.anchor.top() ? anchorRect.y : state.anchor.bottom() ? anchorRect.extent().y : anchorRect.middle().y;
auto calcEffectiveX = [&]() { return state.gravity.left() ? anchorX - width : state.gravity.right() ? anchorX : anchorX - width / 2; };
auto calcEffectiveY = [&]() { return state.gravity.top() ? anchorY - height : state.gravity.bottom() ? anchorY : anchorY - height / 2; };
auto calcEffectiveX = [&](CEdges anchorGravity, double anchorX) { return anchorGravity.left() ? anchorX - width : anchorGravity.right() ? anchorX : anchorX - width / 2; };
auto calcEffectiveY = [&](CEdges anchorGravity, double anchorY) { return anchorGravity.top() ? anchorY - height : anchorGravity.bottom() ? anchorY : anchorY - height / 2; };
auto effectiveX = calcEffectiveX();
auto effectiveY = calcEffectiveY();
auto calcRemainingWidth = [&](double effectiveX) {
auto width = state.requestedSize.x;
if (effectiveX < constraint.x) {
auto diff = constraint.x - effectiveX;
effectiveX = constraint.x;
width -= diff;
}
auto effectiveX2 = effectiveX + width;
if (effectiveX2 > constraint.extent().x)
width -= effectiveX2 - constraint.extent().x;
return std::make_pair(effectiveX, width);
};
auto calcRemainingHeight = [&](double effectiveY) {
auto height = state.requestedSize.y;
if (effectiveY < constraint.y) {
auto diff = constraint.y - effectiveY;
effectiveY = constraint.y;
height -= diff;
}
auto effectiveY2 = effectiveY + height;
if (effectiveY2 > constraint.extent().y)
height -= effectiveY2 - constraint.extent().y;
return std::make_pair(effectiveY, height);
};
auto effectiveX = calcEffectiveX(gravity, anchorX);
auto effectiveY = calcEffectiveY(gravity, anchorY);
// Note: the usage of offset is a guess which maintains compatibility with other compositors that were tested.
// It considers the offset when deciding whether or not to flip but does not actually flip the offset, instead
// applying it after the flip step.
if (state.constraintAdjustment & XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_FLIP_X) {
auto flip = (state.gravity.left() && effectiveX + state.offset.x < constraint.x) || (state.gravity.right() && effectiveX + state.offset.x + width > constraint.extent().x);
auto flip = (gravity.left() && effectiveX + state.offset.x < constraint.x) || (gravity.right() && effectiveX + state.offset.x + width > constraint.extent().x);
if (flip) {
state.gravity ^= CEdges::LEFT | CEdges::RIGHT;
anchorX = state.anchor.left() ? anchorRect.extent().x : state.anchor.right() ? anchorRect.x : anchorX;
effectiveX = calcEffectiveX();
auto newGravity = gravity ^ (CEdges::LEFT | CEdges::RIGHT);
auto newAnchorX = state.anchor.left() ? anchorRect.extent().x : state.anchor.right() ? anchorRect.x : anchorX;
auto newEffectiveX = calcEffectiveX(newGravity, newAnchorX);
if (calcRemainingWidth(newEffectiveX).second > calcRemainingWidth(effectiveX).second) {
gravity = newGravity;
anchorX = newAnchorX;
effectiveX = newEffectiveX;
}
}
}
@ -561,9 +598,15 @@ CBox CXDGPositionerRules::getPosition(CBox constraint, const Vector2D& parentCoo
auto flip = (state.gravity.top() && effectiveY + state.offset.y < constraint.y) || (state.gravity.bottom() && effectiveY + state.offset.y + height > constraint.extent().y);
if (flip) {
state.gravity ^= CEdges::TOP | CEdges::BOTTOM;
anchorY = state.anchor.top() ? anchorRect.extent().y : state.anchor.bottom() ? anchorRect.y : anchorY;
effectiveY = calcEffectiveY();
auto newGravity = gravity ^ (CEdges::TOP | CEdges::BOTTOM);
auto newAnchorY = state.anchor.top() ? anchorRect.extent().y : state.anchor.bottom() ? anchorRect.y : anchorY;
auto newEffectiveY = calcEffectiveY(newGravity, newAnchorY);
if (calcRemainingHeight(newEffectiveY).second > calcRemainingHeight(effectiveY).second) {
gravity = newGravity;
anchorY = newAnchorY;
effectiveY = newEffectiveY;
}
}
}
@ -589,27 +632,15 @@ CBox CXDGPositionerRules::getPosition(CBox constraint, const Vector2D& parentCoo
}
if (state.constraintAdjustment & XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_RESIZE_X) {
if (effectiveX < constraint.x) {
auto diff = constraint.x - effectiveX;
effectiveX = constraint.x;
width -= diff;
}
auto effectiveX2 = effectiveX + width;
if (effectiveX2 > constraint.extent().x)
width -= effectiveX2 - constraint.extent().x;
auto [newX, newWidth] = calcRemainingWidth(effectiveX);
effectiveX = newX;
width = newWidth;
}
if (state.constraintAdjustment & XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_RESIZE_Y) {
if (effectiveY < constraint.y) {
auto diff = constraint.y - effectiveY;
effectiveY = constraint.y;
height -= diff;
}
auto effectiveY2 = effectiveY + height;
if (effectiveY2 > constraint.extent().y)
height -= effectiveY2 - constraint.extent().y;
auto [newY, newHeight] = calcRemainingHeight(effectiveY);
effectiveY = newY;
height = newHeight;
}
return {effectiveX - parentCoord.x, effectiveY - parentCoord.y, width, height};