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GT_Window.cpp
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GT_Window.cpp
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#include <assert.h>
#include <stdio.h>
#include "GT_Window.h"
////////////////
// Constants //
//////////////
const char* kWindowClassName = "GTWindowVersion1_1";
/////////////////////
// Static Members //
///////////////////
int CWindow::mRegisterCount = 0;
// CWindow's WinProc
LRESULT CALLBACK GTWinProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam);
// Constructor
CWindow::CWindow()
{
zeroVars();
}
// Init the CWindow
bool CWindow::init(HINSTANCE hinstance, const SWinInfo &winInfo)
{
// Error Check
if(mHinst || !hinstance)
return false; // Already initialised OR "hinstance" == NULL
try // Try and create this window and add it to the list
{
// Set data members
mHinst = hinstance;
mStyle = winInfo.winStyle;
mExStyle = winInfo.winExStyle;
mActive = true; // Window is becoming active
mFullScreen = false; // Start in windowed mode
if(!registerWndClass())
throw "Couldn't register WNDCLASSEX";
// Set desired client RECT
mRect.left = mRect.top = 0;
mRect.right = winInfo.width;
mRect.bottom = winInfo.height;
// Adjust window rect so it gives us our desired client rect when we
// create the window
AdjustWindowRectEx(&mRect, mStyle, (winInfo.menu != NULL), mExStyle);
mHwnd = CreateWindowEx( mExStyle,
kWindowClassName,
winInfo.titleBarText,
mStyle,
CW_USEDEFAULT,
CW_USEDEFAULT,
mRect.right - mRect.left,
mRect.bottom - mRect.top,
NULL,
winInfo.menu,
NULL,
this ); // Pointer to self
if(!mHwnd)
throw "Couldn't create the window";
// Get window's client RECT
GetClientRect(mHwnd, &mRect);
// Make sure it's what we requested
if(mRect.bottom != winInfo.height || mRect.right != winInfo.width)
throw "Window's client RECT does not equal desired client RECT";
// Capture window's HDC
mHdc = GetDC(mHwnd);
// Error Check
if(mHdc == NULL)
throw "Couldn't get window's HDC";
}
catch(char* err)
{
OutputError(err);
return false;
}
ShowWindow(mHwnd, true);
UpdateWindow(mHwnd);
return true; // Created successfully
}
// CWindow's WNDPROC
LRESULT CWindow::wndProc(UINT message, WPARAM wparam, LPARAM lparam)
{
switch(message)
{
case WM_ACTIVATE:
{
if((LOWORD(wparam) == WA_INACTIVE) || (HIWORD(wparam) != 0))
mActive = false;
else
mActive = true;
return 0;
}
case WM_CLOSE:
destroy();
return 0;
}
return DefWindowProc(mHwnd, message, wparam, lparam);
}
// Set the size of the window
bool CWindow::setWindowSize(int wid, int hgt)
{
assert(wid > 0);
assert(hgt > 0);
assert(mHwnd != NULL);
if(!SetWindowPos(mHwnd, NULL, 0, 0, wid, hgt, SWP_NOZORDER | SWP_NOMOVE))
return false;
// Get the new client size
GetClientRect(mHwnd, &mRect);
#ifdef _DEBUG
RECT rect = {0};
GetWindowRect(mHwnd, &rect);
assert(rect.right - rect.left == wid);
assert(rect.bottom - rect.top == hgt);
#endif
return true;
}
// Set the size of the client area of the window
bool CWindow::setClientSize(int wid, int hgt)
{
assert(wid > 0);
assert(hgt > 0);
assert(mHwnd != NULL);
RECT rect = {0, 0, wid, hgt};
// Get desired dimensions
if(!AdjustWindowRectEx(&rect, mStyle, FALSE, mExStyle))
return false;
if(!SetWindowPos(mHwnd, NULL, 0, 0, rect.right - rect.left, rect.bottom - rect.top, SWP_NOZORDER | SWP_NOMOVE))
return false;
// Get the new client size
GetClientRect(mHwnd, &mRect);
assert(mRect.right == wid);
assert(mRect.bottom == hgt);
return true;
}
// Sets the window's icons
bool CWindow::setIcons(HICON icon, HICON smallIcon)
{
if(icon)
SendMessage(mHwnd, WM_SETICON, ICON_BIG, (LPARAM)icon);
if(smallIcon)
SendMessage(mHwnd, WM_SETICON, ICON_SMALL, (LPARAM)smallIcon);
return true;
}
// Sets the window's menu
bool CWindow::setMenu(HMENU hmenu)
{
if(hmenu)
{
if(!SetMenu(mHwnd, hmenu))
return false;
// Get the new client size
GetClientRect(mHwnd, &mRect);
return true;
}
else
return false;
}
// Sets the style of window
bool CWindow::setStyle(DWORD style, DWORD exStyle)
{
bool styleSet = false; // Assume style will not be set
// If we have a style to set
if(style != kIgnoreStyle)
{
SetLastError(0); // Clear out error log
// Always make sure style will be visible
int ret = SetWindowLongPtr(mHwnd, GWL_STYLE, style);
// If there has been an error
if(ret == 0 && (GetLastError() != 0))
return false;
mStyle = style; // Set style
styleSet = true;
}
// If we have an extended style to set
if(exStyle != kIgnoreStyle)
{
SetLastError(0);
int ret = SetWindowLongPtr(mHwnd, GWL_EXSTYLE, exStyle);
// If there has been an error
if(ret == 0 && (GetLastError() != 0))
return false;
mExStyle = exStyle; // Set extended style
styleSet = true;
}
// If we set a style, call this function to make sure window is updated
if(styleSet)
{
if(!SetWindowPos(mHwnd, NULL, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_FRAMECHANGED))
return false;
GetClientRect(mHwnd, &mRect); // Update client RECT
ShowWindow(mHwnd, SW_SHOW); // Make sure the window is shown
return true;
}
return false; // No style was changed
}
// Toggles between full screen and windowed mode
bool CWindow::toggleFullScreen()
{
static WINDOWPLACEMENT windowPos = {0};
static DWORD prevExStyle = mExStyle;
static DWORD prevStyle = mStyle;
if(mFullScreen)
{
if(!setStyle(prevStyle, prevExStyle))
return false;
// Get window width and height
int wid = windowPos.rcNormalPosition.right - windowPos.rcNormalPosition.left;
int hgt = windowPos.rcNormalPosition.bottom - windowPos.rcNormalPosition.top;
if(!setWindowSize(wid, hgt))
return false;
if(!SetWindowPlacement(mHwnd, &windowPos))
return false;
}
else
{
// Store off previous styles
prevExStyle = mExStyle;
prevStyle = mStyle;
// Store off window placement
GetWindowPlacement(mHwnd, &windowPos);
DEVMODE devMode = {0};
// Get the current display settings
if(!EnumDisplaySettings(NULL,ENUM_CURRENT_SETTINGS,&devMode))
return false;
// Attempt to change style
if(setStyle(WS_POPUP) == false)
return false;
int wid = devMode.dmPelsWidth;
int hgt = devMode.dmPelsHeight;
if(!setClientSize(wid, hgt)) // Set the client size of the window
return false;
// Move the window to (0,0)
SetWindowPos(mHwnd, NULL, 0, 0, 0, 0, SWP_NOCOPYBITS | SWP_NOZORDER | SWP_NOSIZE);
}
mFullScreen = !mFullScreen; // Toggle flag
return true; // Change made successfully
}
// Destroy the window
bool CWindow::destroy()
{
if(mHdc)
{
int r = ReleaseDC(mHwnd, mHdc);
assert(r != 0);
mHdc = NULL;
}
if(DestroyWindow(mHwnd))
{
mHwnd = NULL;
return true;
}
else
return false; // Couldn't destroy window
}
// Deconstructor
CWindow::~CWindow()
{
assert(mHdc == NULL && "HDC was not released");
// If the window was initialized, decrement the register count and if
// it equals zero, unregister the class
if(--mRegisterCount == 0)
{
BOOL b = UnregisterClass(kWindowClassName, mHinst);
assert(b == TRUE);
}
}
// *** Private Methods ***
void CWindow::zeroVars()
{
mHinst = NULL;
mHwnd = NULL;
mHdc = NULL;
mRect.left = mRect.right = mRect.bottom = mRect.top = 0;
mStyle = mExStyle = 0;
mFullScreen = false;
mActive = false;
}
// Register the WNDCLASSEX
bool CWindow::registerWndClass()
{
if(mRegisterCount++ == 0)
{
WNDCLASSEX wndclassex = {0};
// Init fields we care about
wndclassex.cbSize = sizeof(WNDCLASSEX); // Always set to size of WNDCLASSEX
wndclassex.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC | CS_PARENTDC;
wndclassex.lpfnWndProc = GTWinProc;
wndclassex.hInstance = mHinst;
wndclassex.lpszClassName = kWindowClassName;
wndclassex.hCursor = (HCURSOR)LoadImage(NULL, MAKEINTRESOURCE(IDC_ARROW),
IMAGE_CURSOR, 0, 0, LR_SHARED); // Default cursor
if(!RegisterClassEx(&wndclassex)) // Register the WNDCLASSEX
return false;
}
return true; // It worked!
}
#pragma warning(push)
#pragma warning(disable : 4311 4312)
// WinProc
LRESULT CALLBACK GTWinProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
{
CWindow *current = NULL;
switch(msg)
{
case WM_CREATE:
current = (CWindow*)((LPCREATESTRUCT)lparam)->lpCreateParams;
SetWindowLongPtr(hwnd, GWLP_USERDATA, (LONG)current);
return 0;
}
current = (CWindow*)GetWindowLongPtr(hwnd, GWLP_USERDATA);
if(current)
return current->wndProc(msg, wparam, lparam);
else
return DefWindowProc(hwnd, msg, wparam, lparam);
}
#pragma warning(pop)