More refactoring for Viewer

tools/viewer/Window.cpp

-/*
-* Copyright 2016 Google Inc.
-*
-* Use of this source code is governed by a BSD-style license that can be
-* found in the LICENSE file.
-*/
-
-#include "Window.h"
-
-#include "SkSurface.h"
-#include "SkCanvas.h"
-#include "VulkanTestContext.h"
-
-namespace sk_app {
-
-static bool default_char_func(SkUnichar c, uint32_t modifiers, void* userData) {
-    return false;
-}
-
-static bool default_key_func(Window::Key key, Window::InputState state, uint32_t modifiers, 
-                             void* userData) {
-    return false;
-}
-
-static bool default_mouse_func(int x, int y, Window::InputState state, uint32_t modifiers, 
-                               void* userData) {
-    return false;
-}
-
-static void default_paint_func(SkCanvas*, void* userData) {}
-
-Window::Window() : fCharFunc(default_char_func)
-                 , fKeyFunc(default_key_func)
-                 , fMouseFunc(default_mouse_func)
-                 , fPaintFunc(default_paint_func) {
-}
-
-void Window::detach() {
-    delete fTestContext;
-    fTestContext = nullptr;
-}
-
-bool Window::onChar(SkUnichar c, uint32_t modifiers) {
-    return fCharFunc(c, modifiers, fCharUserData);
-}
-
-bool Window::onKey(Key key, InputState state, uint32_t modifiers) {
-    return fKeyFunc(key, state, modifiers, fKeyUserData);
-}
-
-bool Window::onMouse(int x, int y, InputState state, uint32_t modifiers) {
-    return fMouseFunc(x, y, state, modifiers, fMouseUserData);
-}
-
-void Window::onPaint() {
-    SkSurface* backbuffer = fTestContext->getBackbufferSurface();
-    if (backbuffer) {
-        // draw into the canvas of this surface
-        SkCanvas* canvas = backbuffer->getCanvas();
-
-        fPaintFunc(canvas, fPaintUserData);
-
-        canvas->flush();
-
-        fTestContext->swapBuffers();
-    } else {
-        // try recreating testcontext
-    }
-
-}
-
-void Window::onResize(uint32_t w, uint32_t h) {
-    fWidth = w;
-    fHeight = h;
-    fTestContext->resize(w, h);
-}
-
-}   // namespace sk_app