annotate Platforms/Wasm/wasm-viewport.ts @ 454:50229f6eb4cd

TS: one touch drag is not equivalent to left mouse drag instead of middle mouse drag
author Alain Mazy <alain@mazy.be>
date Fri, 18 Jan 2019 11:52:10 +0100
parents 59b4afa92dee
children 3b4df9925db6 7cdb4634846c
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1 var isPendingRedraw = false;
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2
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3 function ScheduleWebViewportRedraw(cppViewportHandle: any) : void
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4 {
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5 if (!isPendingRedraw) {
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6 isPendingRedraw = true;
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7 console.log('Scheduling a refresh of the viewport, as its content changed');
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8 window.requestAnimationFrame(function() {
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9 isPendingRedraw = false;
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10 Stone.WasmViewport.GetFromCppViewport(cppViewportHandle).Redraw();
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11 });
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12 }
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13 }
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15 declare function UTF8ToString(any): string;
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16
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17 function CreateWasmViewport(htmlCanvasId: string) : any {
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18 var cppViewportHandle = CreateCppViewport();
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19 var canvasId = UTF8ToString(htmlCanvasId);
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20 var webViewport = new Stone.WasmViewport(StoneFrameworkModule, canvasId, cppViewportHandle); // viewports are stored in a static map in WasmViewport -> won't be deleted
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21 webViewport.Initialize();
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22
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23 return cppViewportHandle;
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24 }
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25
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26 module Stone {
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27
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28 // export declare type InitializationCallback = () => void;
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29
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30 // export declare var StoneFrameworkModule : any;
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31
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32 //const ASSETS_FOLDER : string = "assets/lib";
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33 //const WASM_FILENAME : string = "orthanc-framework";
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34
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35 export class WasmViewport {
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36
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37 private static viewportsMapByCppHandle_ : Map<number, WasmViewport> = new Map<number, WasmViewport>(); // key = the C++ handle
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38 private static viewportsMapByCanvasId_ : Map<string, WasmViewport> = new Map<string, WasmViewport>(); // key = the canvasId
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39
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40 private module_ : any;
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41 private canvasId_ : string;
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42 private htmlCanvas_ : HTMLCanvasElement;
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43 private context_ : CanvasRenderingContext2D;
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44 private imageData_ : any = null;
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45 private renderingBuffer_ : any = null;
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46
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47 private touchGestureInProgress_: boolean = false;
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48 private touchCount_: number = 0;
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49 private touchGestureLastCoordinates_: [number, number][] = []; // last x,y coordinates of each touch
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51 private touchZoom_ : any = false;
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52 private touchTranslation_ : any = false;
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53
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54 private ViewportSetSize : Function;
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55 private ViewportRender : Function;
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56 private ViewportMouseDown : Function;
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57 private ViewportMouseMove : Function;
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58 private ViewportMouseUp : Function;
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59 private ViewportMouseEnter : Function;
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60 private ViewportMouseLeave : Function;
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61 private ViewportMouseWheel : Function;
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62 private ViewportKeyPressed : Function;
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63
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64 private pimpl_ : any; // Private pointer to the underlying WebAssembly C++ object
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65
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66 public constructor(module: any, canvasId: string, cppViewport: any) {
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67
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68 this.pimpl_ = cppViewport;
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69 WasmViewport.viewportsMapByCppHandle_[this.pimpl_] = this;
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70 WasmViewport.viewportsMapByCanvasId_[canvasId] = this;
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71
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72 this.module_ = module;
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73 this.canvasId_ = canvasId;
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74 this.htmlCanvas_ = document.getElementById(this.canvasId_) as HTMLCanvasElement;
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75 if (this.htmlCanvas_ == null) {
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76 console.log("Can not create WasmViewport, did not find the canvas whose id is '", this.canvasId_, "'");
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77 }
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78 this.context_ = this.htmlCanvas_.getContext('2d');
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79
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80 this.ViewportSetSize = this.module_.cwrap('ViewportSetSize', null, [ 'number', 'number', 'number' ]);
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81 this.ViewportRender = this.module_.cwrap('ViewportRender', null, [ 'number', 'number', 'number', 'number' ]);
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82 this.ViewportMouseDown = this.module_.cwrap('ViewportMouseDown', null, [ 'number', 'number', 'number', 'number', 'number' ]);
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83 this.ViewportMouseMove = this.module_.cwrap('ViewportMouseMove', null, [ 'number', 'number', 'number' ]);
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84 this.ViewportMouseUp = this.module_.cwrap('ViewportMouseUp', null, [ 'number' ]);
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85 this.ViewportMouseEnter = this.module_.cwrap('ViewportMouseEnter', null, [ 'number' ]);
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86 this.ViewportMouseLeave = this.module_.cwrap('ViewportMouseLeave', null, [ 'number' ]);
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87 this.ViewportMouseWheel = this.module_.cwrap('ViewportMouseWheel', null, [ 'number', 'number', 'number', 'number', 'number' ]);
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88 this.ViewportKeyPressed = this.module_.cwrap('ViewportKeyPressed', null, [ 'number', 'number', 'string', 'number', 'number' ]);
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89 }
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90
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91 public GetCppViewport() : number {
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92 return this.pimpl_;
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93 }
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94
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95 public static GetFromCppViewport(cppViewportHandle: number) : WasmViewport {
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96 if (WasmViewport.viewportsMapByCppHandle_[cppViewportHandle] !== undefined) {
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97 return WasmViewport.viewportsMapByCppHandle_[cppViewportHandle];
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98 }
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99 console.log("WasmViewport not found !");
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100 return undefined;
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101 }
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102
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103 public static GetFromCanvasId(canvasId: string) : WasmViewport {
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104 if (WasmViewport.viewportsMapByCanvasId_[canvasId] !== undefined) {
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105 return WasmViewport.viewportsMapByCanvasId_[canvasId];
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106 }
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107 console.log("WasmViewport not found !");
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108 return undefined;
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109 }
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110
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111 public static ResizeAll() {
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112 for (let canvasId in WasmViewport.viewportsMapByCanvasId_) {
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113 WasmViewport.viewportsMapByCanvasId_[canvasId].Resize();
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114 }
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115 }
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116
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117 public Redraw() {
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118 if (this.imageData_ === null ||
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119 this.renderingBuffer_ === null ||
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120 this.ViewportRender(this.pimpl_,
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121 this.imageData_.width,
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122 this.imageData_.height,
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123 this.renderingBuffer_) == 0) {
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124 console.log('The rendering has failed');
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125 } else {
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126 // Create an accessor to the rendering buffer (i.e. create a
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127 // "window" above the heap of the WASM module), then copy it to
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128 // the ImageData object
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129 this.imageData_.data.set(new Uint8ClampedArray(
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130 this.module_.buffer,
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131 this.renderingBuffer_,
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132 this.imageData_.width * this.imageData_.height * 4));
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133
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134 this.context_.putImageData(this.imageData_, 0, 0);
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135 }
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136 }
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137
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138 public Resize() {
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139 if (this.imageData_ != null &&
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140 (this.imageData_.width != window.innerWidth ||
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141 this.imageData_.height != window.innerHeight)) {
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142 this.imageData_ = null;
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143 }
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144
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145 // width/height is defined by the parent width/height
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146 this.htmlCanvas_.width = this.htmlCanvas_.parentElement.offsetWidth;
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147 this.htmlCanvas_.height = this.htmlCanvas_.parentElement.offsetHeight;
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148
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149 console.log("resizing WasmViewport: ", this.htmlCanvas_.width, "x", this.htmlCanvas_.height);
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150
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151 if (this.imageData_ === null) {
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152 this.imageData_ = this.context_.getImageData(0, 0, this.htmlCanvas_.width, this.htmlCanvas_.height);
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153 this.ViewportSetSize(this.pimpl_, this.htmlCanvas_.width, this.htmlCanvas_.height);
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154
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155 if (this.renderingBuffer_ != null) {
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156 this.module_._free(this.renderingBuffer_);
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157 }
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158
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159 this.renderingBuffer_ = this.module_._malloc(this.imageData_.width * this.imageData_.height * 4);
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160 } else {
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161 this.ViewportSetSize(this.pimpl_, this.htmlCanvas_.width, this.htmlCanvas_.height);
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162 }
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163
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164 this.Redraw();
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165 }
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166
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167 public Initialize() {
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168
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169 // Force the rendering of the viewport for the first time
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170 this.Resize();
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171
228
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172 var that : WasmViewport = this;
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173 // Register an event listener to call the Resize() function
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174 // each time the window is resized.
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175 window.addEventListener('resize', function(event) {
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176 that.Resize();
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177 }, false);
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178
227
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179 this.htmlCanvas_.addEventListener('contextmenu', function(event) {
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180 // Prevent right click on the canvas
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181 event.preventDefault();
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182 }, false);
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183
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184 this.htmlCanvas_.addEventListener('mouseleave', function(event) {
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185 that.ViewportMouseLeave(that.pimpl_);
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186 });
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187
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188 this.htmlCanvas_.addEventListener('mouseenter', function(event) {
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189 that.ViewportMouseEnter(that.pimpl_);
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190 });
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191
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192 this.htmlCanvas_.addEventListener('mousedown', function(event) {
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193 var x = event.pageX - this.offsetLeft;
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194 var y = event.pageY - this.offsetTop;
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195 that.ViewportMouseDown(that.pimpl_, event.button, x, y, 0 /* TODO detect modifier keys*/);
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196 });
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197
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198 this.htmlCanvas_.addEventListener('mousemove', function(event) {
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199 var x = event.pageX - this.offsetLeft;
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200 var y = event.pageY - this.offsetTop;
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201 that.ViewportMouseMove(that.pimpl_, x, y);
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202 });
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203
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204 this.htmlCanvas_.addEventListener('mouseup', function(event) {
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205 that.ViewportMouseUp(that.pimpl_);
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206 });
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207
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208 window.addEventListener('keydown', function(event) {
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209 var keyChar = event.key;
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210 var keyCode = event.keyCode
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211 if (keyChar.length == 1) {
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212 keyCode = 0; // maps to OrthancStone::KeyboardKeys_Generic
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213 } else {
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214 keyChar = null;
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215 }
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216 // console.log("key: ", keyCode, keyChar);
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217 that.ViewportKeyPressed(that.pimpl_, keyCode, keyChar, event.shiftKey, event.ctrlKey, event.altKey);
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218 });
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219
227
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220 this.htmlCanvas_.addEventListener('wheel', function(event) {
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221 var x = event.pageX - this.offsetLeft;
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222 var y = event.pageY - this.offsetTop;
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223 that.ViewportMouseWheel(that.pimpl_, event.deltaY, x, y, event.ctrlKey);
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224 event.preventDefault();
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225 });
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226
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227 this.htmlCanvas_.addEventListener('touchstart', function(event) {
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228 // don't propagate events to the whole body (this could zoom the entire page instead of zooming the viewport)
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229 event.preventDefault();
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230 event.stopPropagation();
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231
227
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232 that.ResetTouch();
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233 });
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234
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235 this.htmlCanvas_.addEventListener('touchend', function(event) {
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236 // don't propagate events to the whole body (this could zoom the entire page instead of zooming the viewport)
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237 event.preventDefault();
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238 event.stopPropagation();
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239
227
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240 that.ResetTouch();
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241 });
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242
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243 this.htmlCanvas_.addEventListener('touchmove', function(event: TouchEvent) {
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244
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245 // don't propagate events to the whole body (this could zoom the entire page instead of zooming the viewport)
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246 event.preventDefault();
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247 event.stopPropagation();
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248
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249 // if (!that.touchGestureInProgress_) {
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250 // // starting a new gesture
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251 // that.touchCount_ = event.targetTouches.length;
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252 // for (var t = 0; t < event.targetTouches.length; t++) {
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253 // that.touchGestureLastCoordinates_.push([event.targetTouches[t].pageX, event.targetTouches[t].pageY]);
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254 // }
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255 // that.touchGestureInProgress_ = true;
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256 // } else {
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257 // // continuing a gesture
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258 // // TODO: we shall probably forward all touches to the C++ code and let the "interactors/trackers" handle them
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259
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260 // if (that.touchCount_ == 1) { // consider it's a left mouse drag
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261
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262 // }
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263 // }
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264
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265 // TODO: we shall probably forward all touches to the C++ code and let the "interactors/trackers" handle them
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266
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267 if (that.touchTranslation_.length == 2) { //
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268 var t = that.GetTouchTranslation(event);
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269 that.ViewportMouseMove(that.pimpl_, t[0], t[1]);
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270 }
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271 else if (that.touchZoom_.length == 3) {
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272 var z0 = that.touchZoom_;
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273 var z1 = that.GetTouchZoom(event);
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274 that.ViewportMouseMove(that.pimpl_, z0[0], z0[1] - z0[2] + z1[2]);
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275 }
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276 else {
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277 // Realize the gesture event
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278 if (event.targetTouches.length == 1) {
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279 // Exactly one finger inside the canvas => Setup a translation
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280 that.touchTranslation_ = that.GetTouchTranslation(event);
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281 that.ViewportMouseDown(that.pimpl_,
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282 0 /* left button */,
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283 that.touchTranslation_[0],
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284 that.touchTranslation_[1], 0);
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285 } else if (event.targetTouches.length == 2) {
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286 // Exactly 2 fingers inside the canvas => Setup a pinch/zoom
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287 that.touchZoom_ = that.GetTouchZoom(event);
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288 var z0 = that.touchZoom_;
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289 that.ViewportMouseDown(that.pimpl_,
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290 2 /* right button */,
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291 z0[0],
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292 z0[1], 0);
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293 }
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294 }
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295 });
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296 }
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297
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298 public ResetTouch() {
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299 if (this.touchTranslation_ ||
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300 this.touchZoom_) {
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301 this.ViewportMouseUp(this.pimpl_);
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302 }
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303
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304 this.touchTranslation_ = false;
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305 this.touchZoom_ = false;
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306
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307 // this.touchGestureInProgress_ = false;
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308 // this.touchCount_ = 0;
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309 // this.touchGestureLastCoordinates_ = [];
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310 }
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311
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312 public GetTouchTranslation(event) {
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313 var touch = event.targetTouches[0];
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314 return [
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315 touch.pageX,
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316 touch.pageY
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317 ];
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318 }
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320 public GetTouchZoom(event) {
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321 var touch1 = event.targetTouches[0];
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322 var touch2 = event.targetTouches[1];
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323 var dx = (touch1.pageX - touch2.pageX);
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324 var dy = (touch1.pageY - touch2.pageY);
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325 var d = Math.sqrt(dx * dx + dy * dy);
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326 return [
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327 (touch1.pageX + touch2.pageX) / 2.0,
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328 (touch1.pageY + touch2.pageY) / 2.0,
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329 d
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330 ];
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331 }
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332
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333 }
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334 }
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335