DialogTemplate.h

#include "stdafx.h"
#include <Windows.h>


class DialogTemplate {
public:
	DialogTemplate(LPCTSTR caption, DWORD style, int x, int y, int w, int h, LPCTSTR font = NULL, WORD fontSize = 8) {
		usedBufferLength = sizeof(DLGTEMPLATE);
		totalBufferLength = usedBufferLength;

		dialogTemplate = (DLGTEMPLATE*)malloc(totalBufferLength);

		dialogTemplate->style = style;

		if (font != NULL) {
			dialogTemplate->style |= DS_SETFONT;
		}

		dialogTemplate->x = x;
		dialogTemplate->y = y;
		dialogTemplate->cx = w;
		dialogTemplate->cy = h;
		dialogTemplate->cdit = 0;

		dialogTemplate->dwExtendedStyle = 0;

		// The dialog box doesn't have a menu or a special class
		AppendData(_T("\0"), 2);
		AppendData(_T("\0"), 2);

		// Add the dialog's caption to the template
		AppendString(caption);

		if (font != NULL) {
			AppendData(&fontSize, sizeof(WORD));
			AppendString(font);
		}
	}

	void AddComponent(LPCTSTR type, LPCTSTR caption, DWORD style, DWORD exStyle, int x, int y, int w, int h, WORD id) {
		DLGITEMTEMPLATE item;
		item.style = style;
		item.x = x;
		item.y = y;
		item.cx = w;
		item.cy = h;
		item.id = id;

		item.dwExtendedStyle = exStyle;

		AppendData(&item, sizeof(DLGITEMTEMPLATE));

		AppendString(type);
		AppendString(caption);

		WORD creationDataLength = 0;
		AppendData(&creationDataLength, sizeof(WORD));

		// Increment the component count
		dialogTemplate->cdit++;
	}

	void AddButton(LPCTSTR caption, DWORD style, DWORD exStyle, int x, int y, int w, int h, WORD id) {
		AddStandardComponent(0x0080, caption, style, exStyle, x, y, w, h, id);
		WORD creationDataLength = 0;
		AppendData(&creationDataLength, sizeof(WORD));
	}

	void AddEditBox(LPCTSTR caption, DWORD style, DWORD exStyle, int x, int y, int w, int h, WORD id) {
		AddStandardComponent(0x0081, caption, style, exStyle, x, y, w, h, id);
		WORD creationDataLength = 0;
		AppendData(&creationDataLength, sizeof(WORD));
	}

	void AddStatic(LPCTSTR caption, DWORD style, DWORD exStyle, int x, int y, int w, int h, WORD id) {
		AddStandardComponent(0x0082, caption, style, exStyle, x, y, w, h, id);
		WORD creationDataLength = 0;
		AppendData(&creationDataLength, sizeof(WORD));
	}

	void AddListBox(LPCTSTR caption, DWORD style, DWORD exStyle, int x, int y, int w, int h, WORD id) {
		AddStandardComponent(0x0083, caption, style, exStyle, x, y, w, h, id);
		WORD creationDataLength = 0;
		AppendData(&creationDataLength, sizeof(WORD));
	}

	void AddScrollBar(LPCTSTR caption, DWORD style, DWORD exStyle, int x, int y, int w, int h, WORD id) {
		AddStandardComponent(0x0084, caption, style, exStyle, x, y, w, h, id);
		WORD creationDataLength = 0;
		AppendData(&creationDataLength, sizeof(WORD));
	}

	void AddComboBox(LPCTSTR caption, DWORD style, DWORD exStyle, int x, int y, int w, int h, WORD id) {
		AddStandardComponent(0x0085, caption, style, exStyle, x, y, w, h, id);
		WORD creationDataLength = 0;
		AppendData(&creationDataLength, sizeof(WORD));
	}

	/**
	* Returns a pointer to the Win32 dialog template which the object
	* represents. This pointer may become invalid if additional
	* components are added to the template.
	*/

	operator const DLGTEMPLATE*() const {
		return dialogTemplate;
	}

	virtual ~DialogTemplate() {
		free(dialogTemplate);
	}

protected:
	void AddStandardComponent(WORD type, LPCTSTR caption, DWORD style, DWORD exStyle, int x, int y, int w, int h, WORD id) {
		DLGITEMTEMPLATE item;

		// DWORD algin the beginning of the component data
		AlignData(sizeof(DWORD));

		item.style = style;
		item.x = x;
		item.y = y;
		item.cx = w;
		item.cy = h;
		item.id = id;

		item.dwExtendedStyle = exStyle;

		AppendData(&item, sizeof(DLGITEMTEMPLATE));

		WORD preType = 0xFFFF;

		AppendData(&preType, sizeof(WORD));
		AppendData(&type, sizeof(WORD));

		AppendString(caption);

		// Increment the component count
		dialogTemplate->cdit++;
	}

	void AlignData(int size) {
		int paddingSize = usedBufferLength % size;
		if (paddingSize != 0) {
			EnsureSpace(paddingSize);
			usedBufferLength += paddingSize;
		}
	}

	void AppendString(LPCTSTR string) {
		AppendData(LPVOID(string), _tcslen(string) * sizeof(TCHAR));
	}

	void AppendData(void* data, int dataLength) {
		EnsureSpace(dataLength);

		memcpy((char*)dialogTemplate + usedBufferLength, data, dataLength);
		usedBufferLength += dataLength;
	}

	void EnsureSpace(int length) {
		if (length + usedBufferLength > totalBufferLength) {
			totalBufferLength += length * 2;

			void* newBuffer = malloc(totalBufferLength);
			memcpy(newBuffer, dialogTemplate, usedBufferLength);

			free(dialogTemplate);
			dialogTemplate = (DLGTEMPLATE*)newBuffer;
		}
	}

private:
	DLGTEMPLATE* dialogTemplate;

	int totalBufferLength;
	int usedBufferLength;
};


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