use Dialog instead of MessageBox

src/luaengineapp/edit.lua

@@ -109,9 +109,25 @@ function editorSaveFile(file)
 end
 
 function editorAboutBox()
-    showMessageBox(InfoMessageBox, "<h4>LE Text Editor</h4>A simple Text Editor made in Lua Engine", "About LE Text Editor", mainWindow)
+    local dialog = createDialog("About LE Text Editor", mainWindow)
+    local dialogLayout = createLayout(VerticalLayout, dialog)
+    local dialogLabel = createLabel("<h4>LE Text Editor</h4>A simple Text Editor made in Lua Engine", dialog)
+    layoutAddWidget(dialogLayout, dialogLabel)
+    local buttonLayout = createLayout(HorizontalLayout, dialogLayout)
+    createSpacerItem(SizePolicyExpanding, SizePolicyMinimum, buttonLayout)
+    local dialogButton = createPushButton("&OK", dialog)
+    layoutAddWidget(buttonLayout, dialogButton)
+    connect(dialogButton, "clicked()", "closeDialog")
+    setWidgetFixed(dialog)
+    executeWidget(dialog)
+    delete(dialog, DeleteInstant)
 end
 
 function editorClose()
     closeWidget(mainWindow)
 end
+
+function closeDialog(pushButton)
+    disconnect(pushButton, "clicked()")
+    closeWidget(getParent(pushButton))
+end

src/luaenginegui/luaenginegui.pro

@@ -15,7 +15,7 @@
 #* limitations under the License.
 #*****************************************************************************/
 
-QT += core network gui widgets
+QT += core gui widgets
 TARGET = luaenginegui
 TEMPLATE = lib
 CONFIG += c++11