Mercurial > dwindows

/* edge.cpp
 *
 * Allows dw_html_new() to embed a Microsoft Edge (Chromium) browser.
 *
 * Requires Windows 10, 8 or 7 with Microsoft Edge (Chromium) installed.
 *
 * Only included when BUILD_EDGE is defined, will fall back to embedded IE.
 *
 * Currently only buildable with Visual Studio since it requires the EDGE
 * SDK which is currently distributed as a nuget package.
 */
#include "dw.h"
#include "webview2.h"
#include <wrl.h>

using namespace Microsoft::WRL;

#define _DW_HTML_DATA_NAME (char *)"_dw_edge"

extern "C" {

	BOOL _dw_edge_detect(VOID)
	{
		return TRUE;
	}

	/******************************* dw_html_action() **************************
	 * Implements the functionality of a "Back". "Forward", "Home", "Search",
	 * "Refresh", or "Stop" button.
	 *
	 * hwnd =		Handle to the window hosting the browser object.
	 * action =		One of the following:
	 *				0 = Move back to the previously viewed web page.
	 *				1 = Move forward to the previously viewed web page.
	 *				2 = Move to the home page.
	 *				3 = Search.
	 *				4 = Refresh the page.
	 *				5 = Stop the currently loading page.
	 */

	void _dw_edge_action(HWND hwnd, int action)
	{
		IWebView2WebView* webview;

		// Retrieve the browser object's pointer we stored in our window's GWL_USERDATA when
		// we initially attached the browser object to this window.
		webview = (IWebView2WebView*)dw_window_get_data(hwnd, _DW_HTML_DATA_NAME);

		// We want to get the base address (ie, a pointer) to the IWebView2WebView object embedded within the browser
		// object, so we can call some of the functions in the former's table.
		if (webview)
		{
			// Call the desired function
			switch (action)
			{
			case DW_HTML_GOBACK:
			{
				// Call the IWebView2WebView object's GoBack function.
				webview->GoBack();
				break;
			}

			case DW_HTML_GOFORWARD:
			{
				// Call the IWebView2WebView object's GoForward function.
				webview->GoForward();
				break;
			}

			case DW_HTML_GOHOME:
			{
				// Call the IWebView2WebView object's GoHome function.
				//webview->GoHome();
				break;
			}

			case DW_HTML_SEARCH:
			{
				// Call the IWebView2WebView object's GoSearch function.
				//webview->GoSearch();
				break;
			}

			case DW_HTML_RELOAD:
			{
				// Call the IWebView2WebView object's Refresh function.
				webview->Reload();
			}

			case DW_HTML_STOP:
			{
				// Call the IWebView2WebView object's Stop function.
				//webview->Stop();
			}
			}
		}
	}

	/******************************* dw_html_raw() ****************************
	 * Takes a string containing some HTML BODY, and displays it in the specified
	 * window. For example, perhaps you want to display the HTML text of...
	 *
	 * <P>This is a picture.<P><IMG src="mypic.jpg">
	 *
	 * hwnd =		Handle to the window hosting the browser object.
	 * string =		Pointer to nul-terminated string containing the HTML BODY.
	 *				(NOTE: No <BODY></BODY> tags are required in the string).
	 *
	 * RETURNS: 0 if success, or non-zero if an error.
	 */

	int _dw_edge_raw(HWND hwnd, LPCWSTR string)
	{
		IWebView2WebView* webview;

		// Retrieve the browser object's pointer we stored in our window's GWL_USERDATA when
		// we initially attached the browser object to this window.
		webview = (IWebView2WebView*)dw_window_get_data(hwnd, _DW_HTML_DATA_NAME);

		if (webview)
		{
			return DW_ERROR_NONE;
		}
		return DW_ERROR_UNKNOWN;
	}

	/******************************* dw_html_url() ****************************
	 * Displays a URL, or HTML file on disk.
	 *
	 * hwnd =		Handle to the window hosting the browser object.
	 * webPageName =	Pointer to nul-terminated name of the URL/file.
	 *
	 * RETURNS: 0 if success, or non-zero if an error.
	 */

	int _dw_edge_url(HWND hwnd, LPCWSTR url)
	{
		IWebView2WebView* webview;

		// Retrieve the browser object's pointer we stored in our window's GWL_USERDATA when
		// we initially attached the browser object to this window.
		webview = (IWebView2WebView*)dw_window_get_data(hwnd, _DW_HTML_DATA_NAME);

		if (webview)
		{
			webview->Navigate(url);
			return DW_ERROR_NONE;
		}
		return DW_ERROR_UNKNOWN;
	}

	/************************** browserWindowProc() *************************
	 * Our message handler for our window to host the browser.
	 */

	LRESULT CALLBACK _edgeWindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
	{
		switch (uMsg)
		{
		case WM_SIZE:
		{
			// Resize the browser object to fit the window
			RECT bounds;
			IWebView2WebView* webview;

			// Retrieve the browser object's pointer we stored in our window's GWL_USERDATA when
			// we initially attached the browser object to this window.
			webview = (IWebView2WebView*)dw_window_get_data(hWnd, _DW_HTML_DATA_NAME);
			GetClientRect(hWnd, &bounds);
			// Resize WebView to fit the bounds of the parent window
			if (webview)
				webview->put_Bounds(bounds);
			return(0);
		}

		case WM_CREATE:
		{
			// Step 3 - Create a single WebView within the parent window
			// Locate the browser and set up the environment for WebView
			CreateWebView2EnvironmentWithDetails(nullptr, nullptr, nullptr,
				Callback<IWebView2CreateWebView2EnvironmentCompletedHandler>(
					[hWnd](HRESULT result, IWebView2Environment* env) -> HRESULT {

						// Create a WebView, whose parent is the main window hWnd
						env->CreateWebView(hWnd, Callback<IWebView2CreateWebViewCompletedHandler>(
							[hWnd](HRESULT result, IWebView2WebView* webview) -> HRESULT {
								if (webview != nullptr) {
									dw_window_set_data(hWnd, _DW_HTML_DATA_NAME, DW_POINTER(webview));
								}

								// Add a few settings for the webview
								// this is a redundant demo step as they are the default settings values
								IWebView2Settings* Settings;
								webview->get_Settings(&Settings);
								Settings->put_IsScriptEnabled(TRUE);
								Settings->put_AreDefaultScriptDialogsEnabled(TRUE);
								Settings->put_IsWebMessageEnabled(TRUE);

								// Resize WebView to fit the bounds of the parent window
								RECT bounds;
								GetClientRect(hWnd, &bounds);
								webview->put_Bounds(bounds);
								return S_OK;
							}).Get());
						return S_OK;
					}).Get());

			// Success
			return(0);
		}

		case WM_DESTROY:
		{
			// Detach the browser object from this window, and free resources.
			IWebView2WebView* webview;

			// Retrieve the browser object's pointer we stored in our window's GWL_USERDATA when
			// we initially attached the browser object to this window.
			webview = (IWebView2WebView*)dw_window_get_data(hWnd, _DW_HTML_DATA_NAME);
			if (webview)
			{
				dw_window_set_data(hWnd, _DW_HTML_DATA_NAME, NULL);
				webview->Close();

			}
			return(TRUE);
		}
		}

		return(DefWindowProc(hWnd, uMsg, wParam, lParam));
	}
}
author	bsmith@81767d24-ef19-dc11-ae90-00e081727c95
date	Thu, 31 Oct 2019 08:26:58 +0000
parents	4e808c4cadfb
children	f7acca46f795