hge source explor 0x2 windows module

Windows窗口

　　hge的window窗口的具体建立是在System_Initiate函数中，现在将hge中关于Windows窗口相关的代码拿出来。

　　Windows相关参数

windows attribute
hge_impl.h	HINSTANCE hInstance; HWND hwnd; HWND hwndParent; bool bActive; const char* szIcon; char szWinTitle[256]; int nScreenWidth; int nScreenHeight; bool bWindowed; bool bHideMouse; RECT rectW; LONG styleW; RECT rectFS; LONG styleFS;
system.cpp	const char　　　　　　*WINDOW_CLASS_NAME = "HGE__WNDCLASS"; WNDCLASS　　　　　　　winclass; int 　　width, height;

　　在有了上面的参数之后，就开始创建一个窗口，详细看system.cpp文件中的System_Initiate函数中的部分。具体实现为：

创建过程
填写WNDCLASS wndclass	winclass.style = CS_DBLCLKS | CS_OWNDC | CS_HREDRAW | CS_VREDRAW; winclass.lpfnWndProc = WindowProc; winclass.cbClsExtra = 0; winclass.cbWndExtra = 0; winclass.hInstance = hInstance; winclass.hCursor = LoadCursor(NULL, IDC_ARROW); winclass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH); winclass.lpszMenuName = NULL; winclass.lpszClassName = WINDOW_CLASS_NAME; if(szIcon) winclass.hIcon = LoadIcon(hInstance, szIcon); else winclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
注册 wndclass	if (!RegisterClass(&winclass)) { _PostError("Can't register window class"); return false; }
设置窗口大小和窗口格式	width=nScreenWidth + GetSystemMetrics(SM_CXFIXEDFRAME)*2; height=nScreenHeight + GetSystemMetrics(SM_CYFIXEDFRAME)*2 + GetSystemMetrics(SM_CYCAPTION); rectW.left=(GetSystemMetrics(SM_CXSCREEN)-width)/2; rectW.top=(GetSystemMetrics(SM_CYSCREEN)-height)/2; rectW.right=rectW.left+width; rectW.bottom=rectW.top+height; styleW=WS_POPUP|WS_CAPTION|WS_SYSMENU|WS_MINIMIZEBOX|WS_VISIBLE; //WS_OVERLAPPED | WS_SYSMENU | WS_MINIMIZEBOX; rectFS.left=0; rectFS.top=0; rectFS.right=nScreenWidth; rectFS.bottom=nScreenHeight; styleFS=WS_POPUP|WS_VISIBLE; //WS_POPUP if(hwndParent) { rectW.left=0; rectW.top=0; rectW.right=nScreenWidth; rectW.bottom=nScreenHeight; styleW=WS_CHILD|WS_VISIBLE; bWindowed=true; }
创建窗口，考虑是否为窗口模式	if(bWindowed) hwnd = CreateWindowEx(0, WINDOW_CLASS_NAME, szWinTitle, styleW, rectW.left, rectW.top, rectW.right-rectW.left, rectW.bottom-rectW.top, hwndParent, NULL, hInstance, NULL); else hwnd = CreateWindowEx(WS_EX_TOPMOST, WINDOW_CLASS_NAME, szWinTitle, styleFS, 0, 0, 0, 0, NULL, NULL, hInstance, NULL);
显示窗口	ShowWindow(hwnd, SW_SHOW);

 

---

　　上面的步骤完成的情况下，关于Windows的创建就完成了，然后只要完成消息处理函数。这样一个窗口就完成了。那么我现在想运行起来的话，至少需要的函数有：

hge.h	virtual bool System_Init() = 0; virtual bool System_Start() = 0; extern "C" { EXPORT GE* GECreate(int ver); }
hge_impl.h	virtual bool System_Init(); virtual bool System_Start(); hge_Impl();

---

　　现在我要把这部分拿出来，写成一个类，然后将所有的关于窗口的操作都通过这个类来实现。已经完成的工程，具体的实现的效果为：

　　

　　那么我的类为

class Win
{
public:
    Win();
    ~Win();
    
    bool        Init();
    void        Shutdown();


public:
    HINSTANCE  　　 hInstance;
    HWND      　　  hwndParent;
    HWND      　　  hwnd;

    WNDCLASSEX     wnd;

    RECT        rWin;
    RECT        rFS;
    LONG        styleWin;
    LONG        styleFS;

    bool        　　bWindowed;
    int            nScreenWidth;
    int            nScreenHeight;
    const char*    szIcon;
    const char* 　　szIconSm;
    char       　　 szWinTitle[256];
    bool        　　bHideMouse;
    bool       　　 bActive;
    
    char       　　 WINDOW_CLASS_NAME[256];
};

 　然后是类的实现

#include "win.h"
#include "ge_impl.h"

// 消息处理函数
LRESULT CALLBACK WinProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam);

Win::Win()
{
    hwnd = 0;
    hwndParent = 0;
    bActive = false;

    wnd.cbSize = 0;
    szIcon = 0;
    szIconSm = 0;
    strcpy(szWinTitle, TEXT("GameEngine Window Module _es"));
    strcpy(WINDOW_CLASS_NAME, TEXT("window_class"));
    nScreenHeight = 600;
    nScreenWidth = 800;
    bWindowed = true;
    bHideMouse = false;
}

bool Win::Init()
{
    // 注册窗口类
    wnd.cbSize = sizeof(WNDCLASSEX);
    wnd.cbClsExtra = 0;
    wnd.cbWndExtra = 0;
    wnd.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
    wnd.hInstance = hInstance;
    wnd.lpszMenuName = 0;
    wnd.hCursor = LoadCursor(NULL, IDC_ARROW);
    wnd.lpszClassName = WINDOW_CLASS_NAME;
    wnd.lpfnWndProc = WinProc;
    wnd.style = CS_DBLCLKS | CS_OWNDC | CS_HREDRAW | CS_VREDRAW;

    if (szIcon){
        wnd.hIcon=LoadIcon(hInstance, szIcon);
    }
    else{
        wnd.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    }

    if (szIconSm){
        wnd.hIconSm = LoadIcon(hInstance, szIconSm);
    }
    else{
        wnd.hIconSm = 0;
    }

    if (!RegisterClassEx(&wnd)){    // 注册窗口失败
        
        return false;
    }


    // 这是要创建的窗口的属性
    int width = nScreenWidth + GetSystemMetrics(SM_CXFIXEDFRAME) * 2;
    int height = nScreenHeight + GetSystemMetrics(SM_CYFIXEDFRAME) * 2 + GetSystemMetrics(SM_CYCAPTION);

    // 窗口化 ，是的窗口在屏幕正中间
    rWin.left = (GetSystemMetrics(SM_CXSCREEN) - width) / 2;
    rWin.top = (GetSystemMetrics(SM_CYSCREEN) - height) / 2;
    rWin.right = rWin.left + width;
    rWin.bottom = rWin.top + height;
    styleWin = WS_POPUP | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX | WS_VISIBLE;

    // 全屏时
    rFS.left = 0;
    rFS.top = 0;
    rFS.right = GetSystemMetrics(SM_CXSCREEN); //GetSystemMetrics(SM_CXSCREEN);
    rFS.bottom = GetSystemMetrics(SM_CYSCREEN); //GetSystemMetrics(SM_CYSCREEN);
    styleFS = WS_POPUP | WS_VISIBLE;

    // 如果为子窗口,定不是全屏
    if (hwndParent)
    {
        rWin.left = 0;
        rWin.top = 0;
        rWin.right = nScreenWidth;
        rWin.right = nScreenHeight;
        styleWin = WS_CHILD | WS_VISIBLE;
        bWindowed = true;
    }

    if (bWindowed){
        hwnd = CreateWindowEx(0, WINDOW_CLASS_NAME, szWinTitle, styleWin, rWin.left, rWin.top, rWin.right - rWin.left, rWin.bottom - rWin.top, hwndParent, NULL, hInstance, NULL);
    }
    else{
        // 全屏模式下就不要考虑 hwndparent
        hwnd = CreateWindowEx(WS_EX_TOPMOST, WINDOW_CLASS_NAME, szWinTitle, styleFS, rFS.left, rFS.top, rFS.right-rFS.left, rFS.bottom-rFS.top, NULL, NULL, hInstance, NULL);
    }

    if (!hwnd){            // 创建窗口失败
        return false;
    }

    // 展示窗口
    ShowWindow(hwnd, SW_SHOW);

    return true;
}

Win::~Win()
{
    //
}

void Win::Shutdown()
{
    if (hwnd){
        DestroyWindow(hwnd);
        hwnd = 0;
    }

    if (!wnd.cbSize){
        UnregisterClass(WINDOW_CLASS_NAME, hInstance);
    }
}

LRESULT CALLBACK WinProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
{
    //bool bActivating;

    switch (msg)  
    {
    case WM_CREATE:
        HDC hdc;
        PAINTSTRUCT ps;
        hdc = BeginPaint(hwnd, &ps);
        EndPaint(hwnd, &ps);
        return FALSE;

    case WM_PAINT:
        break;

    case WM_KEYDOWN:
        if (wparam == VK_ESCAPE){
            if (pge->win){
                MessageBox(hwnd, "Get the escape", "Get Message", MB_OK);
                PostQuitMessage(0);
                break;
            }
        }
        break;

    case WM_DESTROY:
        PostQuitMessage(0);
        return FALSE;
    }

    return DefWindowProc(hwnd, msg, wparam, lparam);
}