Set size hints for xdg-shell and xdg-shell-v6

Send minimum and maximum size hints to compositors.

[ChangeLog][QPA plugin] Implement minimum and maximum size in
the xdg-shell and xdg-shell-v6 shell integrations.

Change-Id: I631c3348c8333d7a246b21228a92c436f5adb5dc
Reviewed-by: Johan Helsing <johan.helsing@qt.io>

1 files changed, 30 insertions, 0 deletions

diff --git a/src/plugins/shellintegration/xdg-shell/qwaylandxdgshell.cpp b/src/plugins/shellintegration/xdg-shell/qwaylandxdgshell.cpp
index cabba5b3b..fc515ca1b 100644
--- a/src/plugins/shellintegration/xdg-shell/qwaylandxdgshell.cpp
+++ b/src/plugins/shellintegration/xdg-shell/qwaylandxdgshell.cpp
@@ -46,6 +46,8 @@
 #include <QtWaylandClient/private/qwaylandscreen_p.h>
 #include <QtWaylandClient/private/qwaylandabstractdecoration_p.h>
 
+#include <QtGui/private/qwindow_p.h>
+
 QT_BEGIN_NAMESPACE
 
 namespace QtWaylandClient {
@@ -104,6 +106,9 @@ void QWaylandXdgSurface::Toplevel::applyConfigure()
 
     QSize windowGeometrySize = m_xdgSurface->m_window->window()->frameGeometry().size();
     m_xdgSurface->set_window_geometry(0, 0, windowGeometrySize.width(), windowGeometrySize.height());
+
+    m_xdgSurface->setSizeHints();
+
     m_applied = m_pending;
     qCDebug(lcQpaWayland) << "Applied pending xdg_toplevel configure event:" << m_applied.size << m_applied.states;
 }
@@ -339,6 +344,31 @@ bool QWaylandXdgSurface::wantsDecorations() const
     return m_toplevel && m_toplevel->wantsDecorations();
 }
 
+void QWaylandXdgSurface::propagateSizeHints()
+{
+    setSizeHints();
+
+    if (m_toplevel && m_window)
+        m_window->commit();
+}
+
+void QWaylandXdgSurface::setSizeHints()
+{
+    if (m_toplevel && m_window) {
+        const int minWidth = qMax(0, m_window->windowMinimumSize().width());
+        const int minHeight = qMax(0, m_window->windowMinimumSize().height());
+        m_toplevel->set_min_size(minWidth, minHeight);
+
+        int maxWidth = qMax(0, m_window->windowMaximumSize().width());
+        if (maxWidth == QWINDOWSIZE_MAX)
+            maxWidth = 0;
+        int maxHeight = qMax(0, m_window->windowMaximumSize().height());
+        if (maxHeight == QWINDOWSIZE_MAX)
+            maxHeight = 0;
+        m_toplevel->set_max_size(maxWidth, maxHeight);
+    }
+}
+
 void QWaylandXdgSurface::requestWindowStates(Qt::WindowStates states)
 {
     if (m_toplevel)