BaseWindow.cpp

// sktoolslib - common files for SK tools

// Copyright (C) 2012-2013, 2015-2018, 2020-2021 - Stefan Kueng

// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software Foundation,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//

#include "stdafx.h"
#include "BaseWindow.h"
#include <memory>
#include <Shlwapi.h>

#pragma comment(lib, "shlwapi.lib")

bool CWindow::RegisterWindow(UINT style, HICON hIcon, HCURSOR hCursor, HBRUSH hbrBackground,
                             LPCWSTR lpszMenuName, LPCWSTR lpszClassName, HICON hIconSm)
{
    WNDCLASSEX wcx;

    // Fill in the window class structure with default parameters

    wcx.cbSize        = sizeof(WNDCLASSEX);       // size of structure
    wcx.style         = style;                    // redraw if size changes
    wcx.lpfnWndProc   = CWindow::stWinMsgHandler; // points to window procedure
    wcx.cbClsExtra    = 0;                        // no extra class memory
    wcx.cbWndExtra    = 0;                        // no extra window memory
    wcx.hInstance     = hResource;                // handle to instance
    wcx.hIcon         = hIcon;                    // predefined app. icon
    wcx.hCursor       = hCursor;                  // predefined arrow
    wcx.hbrBackground = hbrBackground;            // white background brush
    wcx.lpszMenuName  = lpszMenuName;             // name of menu resource
    wcx.lpszClassName = lpszClassName;            // name of window class
    wcx.hIconSm       = hIconSm;                  // small class icon

    // Register the window class.
    return RegisterWindow(&wcx);
}

bool CWindow::RegisterWindow(CONST WNDCLASSEX* wcx)
{
    // Register the window class.
    sClassName            = std::wstring(wcx->lpszClassName);
    bRegisterWindowCalled = true;
    if (RegisterClassEx(wcx) == 0)
    {
        if (GetLastError() == ERROR_CLASS_ALREADY_EXISTS)
            return TRUE;
        return FALSE;
    }
    else
        return TRUE;
}

LRESULT CALLBACK CWindow::stWinMsgHandler(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    if (uMsg == WM_NCCREATE)
    {
        // get the pointer to the window from lpCreateParams which was set in CreateWindow
        SetWindowLongPtr(hwnd, GWLP_USERDATA, reinterpret_cast<LONG_PTR>(reinterpret_cast<LPCREATESTRUCT>(lParam)->lpCreateParams));
    }

    // get the pointer to the window
    CWindow* pWnd = GetObjectFromWindow(hwnd);

    // if we have the pointer, go to the message handler of the window
    // else, use DefWindowProc
    if (pWnd)
    {
        switch (uMsg)
        {
            case WM_CREATE:
                if ((!pWnd->bWindowRestored) && (!pWnd->sRegistryPath.empty()))
                {
                    WINDOWPLACEMENT wpl  = {0};
                    DWORD           size = sizeof(wpl);
                    if (SHGetValue(HKEY_CURRENT_USER, pWnd->sRegistryPath.c_str(), pWnd->sRegistryValue.c_str(), REG_NONE, &wpl, &size) == ERROR_SUCCESS)
                        SetWindowPlacement(hwnd, &wpl);
                    else
                        ShowWindow(hwnd, SW_SHOW);
                    pWnd->bWindowRestored = true;
                }
                break;
            case WM_CLOSE:
                if (!pWnd->sRegistryPath.empty())
                {
                    WINDOWPLACEMENT wpl = {0};
                    wpl.length          = sizeof(WINDOWPLACEMENT);
                    GetWindowPlacement(hwnd, &wpl);
                    SHSetValue(HKEY_CURRENT_USER, pWnd->sRegistryPath.c_str(), pWnd->sRegistryValue.c_str(), REG_NONE, &wpl, sizeof(wpl));
                }
                break;
        }
        return pWnd->WinMsgHandler(hwnd, uMsg, wParam, lParam);
    }
    else
        return DefWindowProc(hwnd, uMsg, wParam, lParam);
}

bool CWindow::Create()
{
    // Create the window
    RECT rect;

    rect.top    = 0;
    rect.left   = 0;
    rect.right  = 600;
    rect.bottom = 400;

    return Create(WS_OVERLAPPEDWINDOW | WS_VISIBLE, nullptr, &rect);
}

bool CWindow::Create(DWORD dwStyles, HWND hParent /* = nullptr */, RECT* rect /* = nullptr */)
{
    return CreateEx(0, dwStyles, hParent, rect);
}

bool CWindow::CreateEx(DWORD dwExStyles, DWORD dwStyles, HWND hParent /* = nullptr */, RECT* rect /* = nullptr */, LPCWSTR classname /* = nullptr */, HMENU hMenu /* = nullptr */)
{
    // send the this pointer as the window creation parameter
    if (rect == nullptr)
        m_hwnd = CreateWindowEx(dwExStyles, classname ? classname : sClassName.c_str(), sWindowTitle.c_str(), dwStyles, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, hParent, hMenu, hResource, static_cast<void*>(this));
    else
    {
        m_hwnd = CreateWindowEx(dwExStyles, classname ? classname : sClassName.c_str(), sWindowTitle.c_str(), dwStyles, rect->left, rect->top,
                                rect->right - rect->left, rect->bottom - rect->top, hParent, hMenu, hResource,
                                static_cast<void*>(this));
    }
    m_hParent = hParent;

    if (!bRegisterWindowCalled)
    {
        ::SetWindowLongPtr(m_hwnd, GWLP_USERDATA, reinterpret_cast<LONG_PTR>(this));
        prevWndProc = reinterpret_cast<WNDPROC>(GetWindowLongPtr(m_hwnd, GWLP_WNDPROC));
        ::SetWindowLongPtr(m_hwnd, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(stWinMsgHandler));
    }

    return (m_hwnd != nullptr);
}

void CWindow::SetTransparency(BYTE alpha, COLORREF color /* = 0xFF000000 */)
{
    if (alpha == 255)
    {
        LONG_PTR exStyle = GetWindowLongPtr(*this, GWL_EXSTYLE);
        exStyle &= ~WS_EX_LAYERED;
        SetWindowLongPtr(*this, GWL_EXSTYLE, exStyle);
    }
    else
    {
        LONG_PTR exStyle = GetWindowLongPtr(*this, GWL_EXSTYLE);
        exStyle |= WS_EX_LAYERED;
        SetWindowLongPtr(*this, GWL_EXSTYLE, exStyle);
    }
    COLORREF col   = color;
    DWORD    flags = LWA_ALPHA;
    if (col & 0xFF000000)
    {
        col   = RGB(255, 255, 255);
        flags = LWA_ALPHA;
    }
    else
    {
        flags = LWA_COLORKEY;
    }
    SetLayeredWindowAttributes(*this, col, alpha, flags);
}