From 7d3aab065ac5d5e087e24d90069fa5693efce463 Mon Sep 17 00:00:00 2001
From: Lorn Potter <lorn.potter@gmail.com>
Date: Tue, 7 Jul 2020 11:15:17 +1000
Subject: wasm: fix resizing of qwidget windows
MIME-Version: 1.0
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This also fixes the cursor changing during resize mode

Fixes: QTBUG-85361
Change-Id: Ic85a5c31a8a2dc4265a84f16fd5fcdc231062c6d
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>
(cherry picked from commit 0de0a6a54c496b5c3c8d79647924476837a02354)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 .../platforms/wasm/qwasmeventtranslator.cpp        | 35 +++++++++++++++++++++-
 src/plugins/platforms/wasm/qwasmeventtranslator.h  |  2 ++
 2 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/src/plugins/platforms/wasm/qwasmeventtranslator.cpp b/src/plugins/platforms/wasm/qwasmeventtranslator.cpp
index c7bae4ba7f..12bee015e7 100644
--- a/src/plugins/platforms/wasm/qwasmeventtranslator.cpp
+++ b/src/plugins/platforms/wasm/qwasmeventtranslator.cpp
@@ -43,6 +43,7 @@
 #include <QtCore/qdeadlinetimer.h>
 #include <private/qmakearray_p.h>
 #include <QtCore/qnamespace.h>
+#include <QCursor>
 
 #include <emscripten/bind.h>
 
@@ -574,8 +575,13 @@ void QWasmEventTranslator::processMouse(int eventType, const EmscriptenMouseEven
     Qt::MouseButton button = translateMouseButton(mouseEvent->button);
     Qt::KeyboardModifiers modifiers = translateMouseEventModifier(mouseEvent);
 
-    QWindow *window2 = screen()->compositor()->windowAt(globalPoint, 5);
+    QWindow *window2 = nullptr;
+    if (resizeMode == QWasmWindow::ResizeNone)
+        window2 = screen()->compositor()->windowAt(globalPoint, 5);
 
+    if (lastWindow && lastWindow->cursor() != Qt::ArrowCursor) {
+        lastWindow->setCursor(Qt::ArrowCursor);
+    }
     if (window2 == nullptr) {
         window2 = lastWindow;
     } else {
@@ -635,6 +641,10 @@ void QWasmEventTranslator::processMouse(int eventType, const EmscriptenMouseEven
     case EMSCRIPTEN_EVENT_MOUSEMOVE: // drag event
     {
         buttonEventType = QEvent::MouseMove;
+
+        if (htmlWindow && htmlWindow->isPointOnResizeRegion(globalPoint))
+            window2->setCursor(cursorForMode(htmlWindow->resizeModeAtPoint(globalPoint)));
+
         if (!(htmlWindow->m_windowState & Qt::WindowFullScreen) && !(htmlWindow->m_windowState & Qt::WindowMaximized)) {
             if (resizeMode == QWasmWindow::ResizeNone && draggedWindow) {
                 draggedWindow->setX(draggedWindow->x() + mouseEvent->movementX);
@@ -989,4 +999,27 @@ bool QWasmEventTranslator::processKeyboard(int eventType, const EmscriptenKeyboa
     return accepted;
 }
 
+QCursor QWasmEventTranslator::cursorForMode(QWasmWindow::ResizeMode m)
+{
+    switch (m) {
+    case QWasmWindow::ResizeTopLeft:
+    case QWasmWindow::ResizeBottomRight:
+        return Qt::SizeFDiagCursor;
+        break;
+    case QWasmWindow::ResizeBottomLeft:
+    case QWasmWindow::ResizeTopRight:
+        return Qt::SizeBDiagCursor;
+        break;
+    case QWasmWindow::ResizeTop:
+    case QWasmWindow::ResizeBottom:
+        return Qt::SizeVerCursor;
+        break;
+    case QWasmWindow::ResizeLeft:
+    case QWasmWindow::ResizeRight:
+        return Qt::SizeHorCursor;
+        break;
+    }
+    return Qt::ArrowCursor;
+}
+
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/wasm/qwasmeventtranslator.h b/src/plugins/platforms/wasm/qwasmeventtranslator.h
index 84e300b7ea..0be5612ef1 100644
--- a/src/plugins/platforms/wasm/qwasmeventtranslator.h
+++ b/src/plugins/platforms/wasm/qwasmeventtranslator.h
@@ -37,6 +37,7 @@
 #include "qwasmwindow.h"
 #include <QtGui/qtouchdevice.h>
 #include <QHash>
+#include <QCursor>
 
 QT_BEGIN_NAMESPACE
 
@@ -94,6 +95,7 @@ private:
 
     Qt::Key m_emDeadKey = Qt::Key_unknown;
     bool m_emStickyDeadKey = false;
+    QCursor cursorForMode(QWasmWindow::ResizeMode mode);
 };
 
 QT_END_NAMESPACE
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