michael@0: const EVENT_OBJECT_SHOW = 0x8002;
michael@0: const EVENT_OBJECT_HIDE = 0x8003;
michael@0: const WINEVENT_OUTOFCONTEXT = 0;
michael@0: const WINEVENT_SKIPOWNPROCESS = 2;
michael@0: const QS_ALLINPUT = 0x04FF;
michael@0: const INFINITE = 0xFFFFFFFF;
michael@0: const WAIT_OBJECT_0 = 0;
michael@0: const WAIT_TIMEOUT = 258;
michael@0: const PM_NOREMOVE = 0;
michael@0: 
michael@0: function DialogWatcher(titleText, onDialogStart, onDialogEnd) {
michael@0:   this.titleText = titleText;
michael@0:   this.onDialogStart = onDialogStart;
michael@0:   this.onDialogEnd = onDialogEnd;
michael@0: }
michael@0: 
michael@0: DialogWatcher.prototype.init = function() {
michael@0:   this.hwnd = undefined;
michael@0:   if (!this.user32) {
michael@0:     this.user32 = ctypes.open("user32.dll");
michael@0:   }
michael@0:   if (!this.findWindow) {
michael@0:     this.findWindow = user32.declare("FindWindowW",
michael@0:                                      ctypes.winapi_abi,
michael@0:                                      ctypes.uintptr_t,
michael@0:                                      ctypes.jschar.ptr,
michael@0:                                      ctypes.jschar.ptr);
michael@0:   }
michael@0:   if (!this.winEventProcType) {
michael@0:     this.winEventProcType = ctypes.FunctionType(ctypes.stdcall_abi,
michael@0:                                                 ctypes.void_t,
michael@0:                                                 [ctypes.uintptr_t,
michael@0:                                                 ctypes.uint32_t,
michael@0:                                                 ctypes.uintptr_t,
michael@0:                                                 ctypes.long,
michael@0:                                                 ctypes.long,
michael@0:                                                 ctypes.uint32_t,
michael@0:                                                 ctypes.uint32_t]).ptr;
michael@0:   }
michael@0:   if (!this.setWinEventHook) {
michael@0:     this.setWinEventHook = user32.declare("SetWinEventHook",
michael@0:                                           ctypes.winapi_abi,
michael@0:                                           ctypes.uintptr_t,
michael@0:                                           ctypes.uint32_t,
michael@0:                                           ctypes.uint32_t,
michael@0:                                           ctypes.uintptr_t,
michael@0:                                           this.winEventProcType,
michael@0:                                           ctypes.uint32_t,
michael@0:                                           ctypes.uint32_t,
michael@0:                                           ctypes.uint32_t);
michael@0:   }
michael@0:   if (!this.unhookWinEvent) {
michael@0:     this.unhookWinEvent = user32.declare("UnhookWinEvent",
michael@0:                                          ctypes.winapi_abi,
michael@0:                                          ctypes.int,
michael@0:                                          ctypes.uintptr_t);
michael@0:   }
michael@0:   if (!this.pointType) {
michael@0:     this.pointType = ctypes.StructType("tagPOINT",
michael@0:                                        [ { "x": ctypes.long },
michael@0:                                          { "y": ctypes.long } ] );
michael@0:   }
michael@0:   if (!this.msgType) {
michael@0:     this.msgType = ctypes.StructType("tagMSG",
michael@0:                                      [ { "hwnd": ctypes.uintptr_t },
michael@0:                                        { "message": ctypes.uint32_t },
michael@0:                                        { "wParam": ctypes.uintptr_t },
michael@0:                                        { "lParam": ctypes.intptr_t },
michael@0:                                        { "time": ctypes.uint32_t },
michael@0:                                        { "pt": this.pointType } ] );
michael@0:   }
michael@0:   if (!this.peekMessage) {
michael@0:     this.peekMessage = user32.declare("PeekMessageW",
michael@0:                                       ctypes.winapi_abi,
michael@0:                                       ctypes.int,
michael@0:                                       this.msgType.ptr,
michael@0:                                       ctypes.uintptr_t,
michael@0:                                       ctypes.uint32_t,
michael@0:                                       ctypes.uint32_t,
michael@0:                                       ctypes.uint32_t);
michael@0:   }
michael@0:   if (!this.msgWaitForMultipleObjects) {
michael@0:     this.msgWaitForMultipleObjects = user32.declare("MsgWaitForMultipleObjects",
michael@0:                                                     ctypes.winapi_abi,
michael@0:                                                     ctypes.uint32_t,
michael@0:                                                     ctypes.uint32_t,
michael@0:                                                     ctypes.uintptr_t.ptr,
michael@0:                                                     ctypes.int,
michael@0:                                                     ctypes.uint32_t,
michael@0:                                                     ctypes.uint32_t);
michael@0:   }
michael@0:   if (!this.getWindowTextW) {
michael@0:     this.getWindowTextW = user32.declare("GetWindowTextW",
michael@0:                                          ctypes.winapi_abi,
michael@0:                                          ctypes.int,
michael@0:                                          ctypes.uintptr_t,
michael@0:                                          ctypes.jschar.ptr,
michael@0:                                          ctypes.int);
michael@0:   }
michael@0:   if (!this.messageBox) {
michael@0:     // Handy for debugging this code
michael@0:     this.messageBox = user32.declare("MessageBoxW",
michael@0:                                      ctypes.winapi_abi,
michael@0:                                      ctypes.int,
michael@0:                                      ctypes.uintptr_t,
michael@0:                                      ctypes.jschar.ptr,
michael@0:                                      ctypes.jschar.ptr,
michael@0:                                      ctypes.uint32_t);
michael@0:   }
michael@0: };
michael@0: 
michael@0: DialogWatcher.prototype.getWindowText = function(hwnd) {
michael@0:   var bufType = ctypes.ArrayType(ctypes.jschar);
michael@0:   var buffer = new bufType(256);
michael@0: 
michael@0:   if (this.getWindowTextW(hwnd, buffer, buffer.length)) {
michael@0:     return buffer.readString();
michael@0:   }
michael@0: };
michael@0: 
michael@0: DialogWatcher.prototype.processWindowEvents = function(timeout) {
michael@0:   var onWinEvent = function(self, hook, event, hwnd, idObject, idChild, dwEventThread, dwmsEventTime) {
michael@0:     var nhwnd = Number(hwnd)
michael@0:     if (event == EVENT_OBJECT_SHOW) {
michael@0:       if (nhwnd == self.hwnd) {
michael@0:         // We've already picked up this event via FindWindow
michael@0:         return;
michael@0:       }
michael@0:       var windowText = self.getWindowText(hwnd);
michael@0:       if (windowText == self.titleText && self.onDialogStart) {
michael@0:         self.hwnd = nhwnd;
michael@0:         self.onDialogStart(nhwnd);
michael@0:       }
michael@0:     } else if (event == EVENT_OBJECT_HIDE && nhwnd == self.hwnd && self.onDialogEnd) {
michael@0:       self.onDialogEnd();
michael@0:       self.hwnd = null;
michael@0:     }
michael@0:   };
michael@0:   var self = this;
michael@0:   var callback = this.winEventProcType(function(hook, event, hwnd, idObject,
michael@0:                                                 idChild, dwEventThread,
michael@0:                                                 dwmsEventTime) {
michael@0:       onWinEvent(self, hook, event, hwnd, idObject, idChild, dwEventThread,
michael@0:                  dwmsEventTime);
michael@0:     } );
michael@0:   var hook = this.setWinEventHook(EVENT_OBJECT_SHOW, EVENT_OBJECT_HIDE,
michael@0:                                   0, callback, 0, 0,
michael@0:                                   WINEVENT_OUTOFCONTEXT | WINEVENT_SKIPOWNPROCESS);
michael@0:   if (!hook) {
michael@0:     return;
michael@0:   }
michael@0:   // Check if the window is already showing
michael@0:   var hwnd = this.findWindow(null, this.titleText);
michael@0:   if (hwnd && hwnd > 0) {
michael@0:     this.hwnd = Number(hwnd);
michael@0:     if (this.onDialogStart) {
michael@0:       this.onDialogStart(this.hwnd);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   if (!timeout) {
michael@0:     timeout = INFINITE;
michael@0:   }
michael@0: 
michael@0:   var waitStatus = WAIT_OBJECT_0;
michael@0:   var expectingStart = this.onDialogStart && this.hwnd === undefined;
michael@0:   var startWaitTime = Date.now();
michael@0:   while (this.hwnd === undefined || this.onDialogEnd && this.hwnd) {
michael@0:     waitStatus = this.msgWaitForMultipleObjects(0, null, 0, expectingStart ?
michael@0:                                                             INFINITE : timeout, 0);
michael@0:     if (waitStatus == WAIT_OBJECT_0) {
michael@0:       var msg = new this.msgType;
michael@0:       this.peekMessage(msg.address(), 0, 0, 0, PM_NOREMOVE);
michael@0:     }
michael@0:     if (waitStatus == WAIT_TIMEOUT || (Date.now() - startWaitTime) >= timeout) {
michael@0:       break;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   this.unhookWinEvent(hook);
michael@0:   // Returns true if the hook was successful, something was found, and we never timed out
michael@0:   return this.hwnd !== undefined && waitStatus == WAIT_OBJECT_0;
michael@0: };
michael@0: