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X11: Ask the host to manage client-initiated resizes

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reuk 2023-07-20 18:52:10 +01:00
parent f8d38edcd4
commit a8fa44e05c
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GPG key ID: FCB43929F012EE5C
8 changed files with 115 additions and 3 deletions
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62
modules/juce_gui_basics/native/juce_XWindowSystem_linux.cpp
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@ -1789,6 +1789,68 @@ void XWindowSystem::setBounds (::Window windowH, Rectangle<int> newBounds, bool
}
}
void XWindowSystem::startHostManagedResize (::Window windowH,
Point<int> mouseDown,
ResizableBorderComponent::Zone zone)
{
const auto moveResize = XWindowSystemUtilities::Atoms::getIfExists (display, "_NET_WM_MOVERESIZE");
if (moveResize == None)
return;
XWindowSystemUtilities::ScopedXLock xLock;
X11Symbols::getInstance()->xUngrabPointer (display, CurrentTime);
const auto root = X11Symbols::getInstance()->xRootWindow (display, X11Symbols::getInstance()->xDefaultScreen (display));
XClientMessageEvent clientMsg;
clientMsg.display = display;
clientMsg.window = windowH;
clientMsg.type = ClientMessage;
clientMsg.format = 32;
clientMsg.message_type = moveResize;
clientMsg.data.l[0] = mouseDown.getX();
clientMsg.data.l[1] = mouseDown.getY();
clientMsg.data.l[2] = [&]
{
// It's unclear which header is supposed to contain these
static constexpr auto _NET_WM_MOVERESIZE_SIZE_TOPLEFT = 0;
static constexpr auto _NET_WM_MOVERESIZE_SIZE_TOP = 1;
static constexpr auto _NET_WM_MOVERESIZE_SIZE_TOPRIGHT = 2;
static constexpr auto _NET_WM_MOVERESIZE_SIZE_RIGHT = 3;
static constexpr auto _NET_WM_MOVERESIZE_SIZE_BOTTOMRIGHT = 4;
static constexpr auto _NET_WM_MOVERESIZE_SIZE_BOTTOM = 5;
static constexpr auto _NET_WM_MOVERESIZE_SIZE_BOTTOMLEFT = 6;
static constexpr auto _NET_WM_MOVERESIZE_SIZE_LEFT = 7;
static constexpr auto _NET_WM_MOVERESIZE_MOVE = 8;
using F = ResizableBorderComponent::Zone::Zones;
switch (zone.getZoneFlags())
{
case F::top | F::left: return _NET_WM_MOVERESIZE_SIZE_TOPLEFT;
case F::top: return _NET_WM_MOVERESIZE_SIZE_TOP;
case F::top | F::right: return _NET_WM_MOVERESIZE_SIZE_TOPRIGHT;
case F::right: return _NET_WM_MOVERESIZE_SIZE_RIGHT;
case F::bottom | F::right: return _NET_WM_MOVERESIZE_SIZE_BOTTOMRIGHT;
case F::bottom: return _NET_WM_MOVERESIZE_SIZE_BOTTOM;
case F::bottom | F::left: return _NET_WM_MOVERESIZE_SIZE_BOTTOMLEFT;
case F::left: return _NET_WM_MOVERESIZE_SIZE_LEFT;
}
return _NET_WM_MOVERESIZE_MOVE;
}();
clientMsg.data.l[3] = 0;
clientMsg.data.l[4] = 1;
X11Symbols::getInstance()->xSendEvent (display,
root,
false,
SubstructureRedirectMask | SubstructureNotifyMask,
unalignedPointerCast<XEvent*> (&clientMsg));
}
void XWindowSystem::updateConstraints (::Window windowH) const
{
if (auto* peer = getPeerFor (windowH))