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annotate win/edge.cpp @ 1999:4e808c4cadfb

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Win: Add initial support for Microsoft Edge (Chromium) embedding. Only works with Visual Studio currently due to the SDK being a nuget package.
author bsmith@81767d24-ef19-dc11-ae90-00e081727c95
date Thu, 31 Oct 2019 07:01:35 +0000
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children 77e43d71eaa7
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rev   line source
1999
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1 /* edge.cpp
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2 *
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3 * Allows dw_html_new() to embed a Microsoft Edge (Chromium) browser.
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4 *
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5 * Requires Windows 10, 8 or 7 with Microsoft Edge (Chromium) installed.
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6 *
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7 * Only included when BUILD_EDGE is defined, will fall back to embedded IE.
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8 *
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9 * Currently only buildable with Visual Studio since it requires the EDGE
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10 * SDK which is currently distributed as a nuget package.
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11 */
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12 #include "dw.h"
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13 #include "webview2.h"
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14
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15 #define _DW_HTML_DATA_NAME (char *)"_dw_edge"
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16
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17 BOOL _dw_edge_detect(VOID)
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18 {
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19 return TRUE;
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20 }
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21
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22 /******************************* dw_html_action() **************************
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23 * Implements the functionality of a "Back". "Forward", "Home", "Search",
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24 * "Refresh", or "Stop" button.
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25 *
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26 * hwnd = Handle to the window hosting the browser object.
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27 * action = One of the following:
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28 * 0 = Move back to the previously viewed web page.
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29 * 1 = Move forward to the previously viewed web page.
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30 * 2 = Move to the home page.
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31 * 3 = Search.
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32 * 4 = Refresh the page.
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33 * 5 = Stop the currently loading page.
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34 *
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35 * NOTE: EmbedBrowserObject() must have been successfully called once with the
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36 * specified window, prior to calling this function. You need call
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37 * EmbedBrowserObject() once only, and then you can make multiple calls to
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38 * this function to display numerous pages in the specified window.
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39 */
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40
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41 void _dw_edge_action(HWND hwnd, int action)
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42 {
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43 IWebView2WebView* webview;
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44
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45 // Retrieve the browser object's pointer we stored in our window's GWL_USERDATA when
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46 // we initially attached the browser object to this window.
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47
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48 webview = *((IWebView2WebView**)dw_window_get_data(hwnd, _DW_HTML_DATA_NAME));
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49 // We want to get the base address (ie, a pointer) to the IWebBrowser2 object embedded within the browser
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50 // object, so we can call some of the functions in the former's table.
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51 if (webview)
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52 {
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53 // Ok, now the pointer to our IWebBrowser2 object is in 'webBrowser2', and so its VTable is
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54 // webBrowser2->lpVtbl.
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55
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56 // Call the desired function
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57 switch (action)
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58 {
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59 case DW_HTML_GOBACK:
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60 {
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61 // Call the IWebBrowser2 object's GoBack function.
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62 webview->GoBack();
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63 break;
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64 }
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65
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66 case DW_HTML_GOFORWARD:
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67 {
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68 // Call the IWebBrowser2 object's GoForward function.
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69 webview->GoForward();
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70 break;
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71 }
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72
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73 case DW_HTML_GOHOME:
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74 {
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75 // Call the IWebBrowser2 object's GoHome function.
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76 //webview->GoHome();
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77 break;
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78 }
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79
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80 case DW_HTML_SEARCH:
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81 {
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82 // Call the IWebBrowser2 object's GoSearch function.
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83 //webview->GoSearch();
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84 break;
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85 }
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86
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87 case DW_HTML_RELOAD:
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88 {
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89 // Call the IWebBrowser2 object's Refresh function.
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90 webview->Reload();
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91 }
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92
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93 case DW_HTML_STOP:
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94 {
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95 // Call the IWebBrowser2 object's Stop function.
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96 //webview->Stop();
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97 }
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98 }
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99 }
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100 }
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101
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102 /******************************* dw_html_raw() ****************************
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103 * Takes a string containing some HTML BODY, and displays it in the specified
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104 * window. For example, perhaps you want to display the HTML text of...
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105 *
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106 * <P>This is a picture.<P><IMG src="mypic.jpg">
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107 *
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108 * hwnd = Handle to the window hosting the browser object.
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109 * string = Pointer to nul-terminated string containing the HTML BODY.
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110 * (NOTE: No <BODY></BODY> tags are required in the string).
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111 *
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112 * RETURNS: 0 if success, or non-zero if an error.
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113 *
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114 * NOTE: EmbedBrowserObject() must have been successfully called once with the
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115 * specified window, prior to calling this function. You need call
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116 * EmbedBrowserObject() once only, and then you can make multiple calls to
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117 * this function to display numerous pages in the specified window.
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118 */
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119
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120 int _dw_edge_raw(HWND hwnd, LPCWSTR string)
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121 {
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122 IWebView2WebView* webview;
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123
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124 // Retrieve the browser object's pointer we stored in our window's GWL_USERDATA when
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125 // we initially attached the browser object to this window.
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126 webview = *((IWebView2WebView**)dw_window_get_data(hwnd, _DW_HTML_DATA_NAME));
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127
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128 if (webview)
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129 {
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130 return DW_ERROR_NONE;
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131 }
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132 return DW_ERROR_UNKNOWN;
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133 }
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134
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135 /******************************* dw_html_url() ****************************
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136 * Displays a URL, or HTML file on disk.
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137 *
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138 * hwnd = Handle to the window hosting the browser object.
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139 * webPageName = Pointer to nul-terminated name of the URL/file.
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140 *
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141 * RETURNS: 0 if success, or non-zero if an error.
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142 *
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143 * NOTE: EmbedBrowserObject() must have been successfully called once with the
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144 * specified window, prior to calling this function. You need call
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145 * EmbedBrowserObject() once only, and then you can make multiple calls to
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146 * this function to display numerous pages in the specified window.
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147 */
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148
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149 int _dw_edge_url(HWND hwnd, LPCWSTR url)
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150 {
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151 IWebView2WebView * webview;
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152
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153 // Retrieve the browser object's pointer we stored in our window's GWL_USERDATA when
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154 // we initially attached the browser object to this window.
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155 webview = *((IWebView2WebView**)dw_window_get_data(hwnd, _DW_HTML_DATA_NAME));
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156
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157 if (webview)
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158 {
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159 webview->Navigate(url);
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160 return DW_ERROR_NONE;
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161 }
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162 return DW_ERROR_UNKNOWN;
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163 }
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164
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165 /************************** browserWindowProc() *************************
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166 * Our message handler for our window to host the browser.
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167 */
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168
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169 LRESULT CALLBACK _edgeWindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
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170 {
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171 switch (uMsg)
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172 {
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173 case WM_SIZE:
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174 {
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175 // Resize the browser object to fit the window
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176 RECT bounds;
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177 IWebView2WebView* webview;
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178
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179 // Retrieve the browser object's pointer we stored in our window's GWL_USERDATA when
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180 // we initially attached the browser object to this window.
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181 webview = *((IWebView2WebView**)dw_window_get_data(hWnd, _DW_HTML_DATA_NAME));
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182 GetClientRect(hWnd, &bounds);
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183 // Resize WebView to fit the bounds of the parent window
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184 if(webview)
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185 webview->put_Bounds(bounds);
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186 return(0);
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187 }
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188
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189 case WM_CREATE:
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190 {
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191 // Step 3 - Create a single WebView within the parent window
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192 // Locate the browser and set up the environment for WebView
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193 CreateWebView2EnvironmentWithDetails(nullptr, nullptr, nullptr,
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194 Callback<IWebView2CreateWebView2EnvironmentCompletedHandler>(
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195 [hWnd](HRESULT result, IWebView2Environment* env) -> HRESULT {
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196
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197 // Create a WebView, whose parent is the main window hWnd
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198 env->CreateWebView(hWnd, Callback<IWebView2CreateWebViewCompletedHandler>(
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199 [hWnd](HRESULT result, IWebView2WebView* webview) -> HRESULT {
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200 if (webview != nullptr) {
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201 dw_window_set_data(hWnd, _DW_HTML_DATA_NAME, DW_POINTER(webview));
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202 }
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203
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204 // Add a few settings for the webview
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205 // this is a redundant demo step as they are the default settings values
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206 IWebView2Settings* Settings;
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207 webview->get_Settings(&Settings);
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208 Settings->put_IsScriptEnabled(TRUE);
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209 Settings->put_AreDefaultScriptDialogsEnabled(TRUE);
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210 Settings->put_IsWebMessageEnabled(TRUE);
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211
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212 // Resize WebView to fit the bounds of the parent window
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213 RECT bounds;
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214 GetClientRect(hWnd, &bounds);
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215 webview->put_Bounds(bounds);
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216 return S_OK;
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217 }).Get());
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218 return S_OK;
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219 }).Get());
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220
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221 // Success
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222 return(0);
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223 }
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224
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225 case WM_DESTROY:
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226 {
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227 // Detach the browser object from this window, and free resources.
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228 IWebView2WebView* webview;
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229
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230 // Retrieve the browser object's pointer we stored in our window's GWL_USERDATA when
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231 // we initially attached the browser object to this window.
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232 webview = *((IWebView2WebView**)dw_window_get_data(hWnd, _DW_HTML_DATA_NAME));
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233 if (webview)
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234 {
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235 dw_window_set_data(hWnd, _DW_HTML_DATA_NAME, NULL);
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236 webview->Close();
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237
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238 }
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239 return(TRUE);
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240 }
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241 }
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242
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243 return(DefWindowProc(hWnd, uMsg, wParam, lParam));
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244 }
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245