Add support for setting window size limits for glfw

Add a function to the window which calls the glfw function for fixing
the size limits of the window. This can then be called after window
creation.

Author: rokob

shell/platform/glfw/flutter_glfw.cc

@@ -34,6 +34,8 @@ using UniqueGLFWwindowPtr = std::unique_ptr<GLFWwindow, void (*)(GLFWwindow*)>;
 
 static_assert(FLUTTER_ENGINE_VERSION == 1, "");
 
+const int kFlutterDesktopDontCare = GLFW_DONT_CARE;
+
 static constexpr double kDpPerInch = 160.0;
 
 // Struct for storing state within an instance of the GLFW Window.
@@ -736,6 +738,14 @@ void FlutterDesktopWindowSetPixelRatioOverride(
   }
 }
 
+void FlutterDesktopWindowSetSizeLimits(FlutterDesktopWindowRef flutter_window,
+                                       FlutterDesktopSize minimum_size,
+                                       FlutterDesktopSize maximum_size) {
+  glfwSetWindowSizeLimits(flutter_window->window, minimum_size.width,
+                          minimum_size.height, maximum_size.width,
+                          maximum_size.height);
+}
+
 bool FlutterDesktopRunWindowEventLoopWithTimeout(
     FlutterDesktopWindowControllerRef controller,
     uint32_t timeout_milliseconds) {

shell/platform/glfw/public/flutter_glfw.h

@@ -16,6 +16,8 @@
 extern "C" {
 #endif
 
+extern const int kFlutterDesktopDontCare;
+
 // Opaque reference to a Flutter window controller.
 typedef struct FlutterDesktopWindowControllerState*
     FlutterDesktopWindowControllerRef;
@@ -26,6 +28,12 @@ typedef struct FlutterDesktopWindow* FlutterDesktopWindowRef;
 // Opaque reference to a Flutter engine instance.
 typedef struct FlutterDesktopEngineState* FlutterDesktopEngineRef;
 
+// Properties representing a generic rectangular size.
+typedef struct {
+  int32_t width;
+  int32_t height;
+} FlutterDesktopSize;
+
 // Properties for configuring a Flutter engine instance.
 typedef struct {
   // The path to the flutter_assets folder for the application to be run.
@@ -167,6 +175,13 @@ FLUTTER_EXPORT void FlutterDesktopWindowSetPixelRatioOverride(
     FlutterDesktopWindowRef flutter_window,
     double pixel_ratio);
 
+// Sets the min/max size of |flutter_window| in pixels. Use
+// kFlutterDesktopDontCare for any dimension you wish to leave unconstrained.
+FLUTTER_EXPORT void FlutterDesktopWindowSetSizeLimits(
+    FlutterDesktopWindowRef flutter_window,
+    FlutterDesktopSize minimum_size,
+    FlutterDesktopSize maximum_size);
+
 // Runs an instance of a headless Flutter engine.
 //
 // Returns a null pointer in the event of an error.