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Promises...

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Jonathan Frederic 11 years ago
parent d466601dbb
commit e02a5ec201
3 changed files with 67 additions and 35 deletions
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5
IPython/html/static/notebook/js/codecell.js
Unescape View File

@ -221,7 +221,7 @@ define([
* Display a widget view in the cell.
*/
CodeCell.prototype.display_widget_view = function(view_promise) {
// Display a dummy element
var dummy = $('<div/>');
this.widget_subarea.append(dummy);
@ -229,8 +229,9 @@ define([
// Display the view.
var that = this;
return view_promise.then(function(view) {
that.widget_area.show();
dummy.replaceWith(view.$el);
this.widget_views.push(view);
that.widget_views.push(view);
return view;
});
};

73
IPython/html/static/widgets/js/manager.js
Unescape View File

@ -61,26 +61,29 @@ define([
reject(new Error("Could not determine where the display" +
" message was from. Widget will not be displayed"));
} else {
return that.display_view_in_cell(cell, model);
return that.display_view_in_cell(cell, model)
.catch(function(error) {
reject(new utils.WrappedError('View could not be displayed.', error));
});
}
});
};
WidgetManager.prototype.display_view_in_cell = function(cell, model) {
// Displays a view in a cell.
var that = this;
return new Promise(function(resolve, reject) {
if (cell.display_widget_view) {
cell.display_widget_view(that.create_view(model, {cell: cell}))
.then(function(view) {
that._handle_display_view(view);
view.trigger('displayed');
resolve(view);
}, function(error) {
reject(new utils.WrappedError('Could not display view', error));
reject(new utils.WrappedError('Could not create or display view', error));
});
} else {
reject(new Error('Cell does not have a `display_widget_view` method.'));
reject(new Error('Cell does not have a `display_widget_view` method'));
}
});
};
@ -280,7 +283,8 @@ define([
// Only return models with one or more displayed views.
// not_alive: (optional) boolean=false
// Include models that have comms with severed connections.
return utils.resolve_promise_dict(function(models) {
var that = this;
return utils.resolve_promises_dict(this._models).then(function(models) {
var state = {};
for (var model_id in models) {
if (models.hasOwnProperty(model_id)) {
@ -291,9 +295,10 @@ define([
var displayed_flag = !(options && options.only_displayed) || Object.keys(model.views).length > 0;
var alive_flag = (options && options.not_alive) || model.comm_alive;
if (displayed_flag && alive_flag) {
state[model.model_id] = {
state[model_id] = {
model_name: model.name,
model_module: model.module,
state: model.get_state(),
views: [],
};
@ -301,8 +306,8 @@ define([
for (var id in model.views) {
if (model.views.hasOwnProperty(id)) {
var view = model.views[id];
var cell_index = this.notebook.find_cell_index(view.options.cell);
state[model.model_id].views.push(cell_index);
var cell_index = that.notebook.find_cell_index(view.options.cell);
state[model_id].views.push(cell_index);
}
}
}
@ -321,40 +326,60 @@ define([
// Get the kernel when it's available.
var that = this;
return (new Promise(function(resolve, reject) {
if (that.kernel) {
resolve(that.kernel);
if (that.comm_manager && that.comm_manager.kernel) {
resolve(that.comm_manager.kernel);
} else {
that.events.on('kernel_created.Session', function(event, data) {
that.events.on('kernel_connected.Session', function(event, data) {
resolve(data.kernel);
});
}
})).then(function(kernel) {
// Recreate all the widget models for the given state.
that.widget_models = [];
for (var i = 0; i < state.length; i++) {
// Recreate all the widget models for the given state and
// display the views.
that.all_views = [];
var model_ids = Object.keys(state);
for (var i = 0; i < model_ids.length; i++) {
var model_id = model_ids[i];
// Recreate a comm using the widget's model id (model_id == comm_id).
var new_comm = new comm.Comm(kernel.widget_manager.comm_target_name, state[i].model_id);
var new_comm = new comm.Comm(kernel.widget_manager.comm_target_name, model_id);
kernel.comm_manager.register_comm(new_comm);
// Create the model using the recreated comm. When the model is
// created we don't know yet if the comm is valid so set_comm_alive
// false. Once we receive the first state push from the back-end
// we know the comm is alive.
var model = kernel.widget_manager.create_model({
var views = kernel.widget_manager.create_model({
comm: new_comm,
model_name: state[i].model_name,
model_module: state[i].model_module}).then(function(model) {
model.set_comm_alive(false);
model.request_state();
model.received_state.then(function() {
model_name: state[model_id].model_name,
model_module: state[model_id].model_module})
.then(function(model) {
model.set_comm_alive(false);
var view_promise = Promise.resolve().then(function() {
return model.set_state(state[model.id].state);
}).then(function() {
model.request_state().then(function() {
model.set_comm_alive(true);
});
return model;
// Display the views of the model.
var views = [];
var model_views = state[model.id].views;
for (var j=0; j<model_views.length; j++) {
var cell_index = model_views[j];
var cell = that.notebook.get_cell(cell_index);
views.push(that.display_view_in_cell(cell, model));
}
return Promise.all(views);
});
that.widget_models.push(model);
return view_promise;
});
that.all_views.push(views);
}
return Promise.all(that.widget_models);
return Promise.all(that.all_views);
});

24
IPython/html/static/widgets/js/widget.js
Unescape View File

@ -32,13 +32,6 @@ define(["widgets/js/manager",
this.id = model_id;
this.views = {};
// Promise that is resolved when a state is received
// from the back-end.
var that = this;
this.received_state = new Promise(function(resolve) {
that._resolve_received_state = resolve;
});
if (comm !== undefined) {
// Remember comm associated with the model.
this.comm = comm;
@ -75,7 +68,16 @@ define(["widgets/js/manager",
console.error("Could not request_state because comm doesn't exist!");
return;
}
// Promise that is resolved when a state is received
// from the back-end.
var that = this;
var received_state = new Promise(function(resolve) {
that._resolve_received_state = resolve;
});
this.comm.send({method: 'request_state'}, callbacks || this.widget_manager.callbacks());
return received_state;
},
set_comm_alive: function(alive) {
@ -132,7 +134,8 @@ define(["widgets/js/manager",
this.trigger('msg:custom', msg.content.data.content);
break;
case 'display':
this.widget_manager.display_view(msg, this);
this.widget_manager.display_view(msg, this)
.catch(utils.reject('Could not display view.', true));
break;
}
},
@ -147,7 +150,10 @@ define(["widgets/js/manager",
} finally {
that.state_lock = null;
}
that._resolve_received_state();
if (that._resolve_received_state !== undefined) {
that._resolve_received_state();
}
return Promise.resolve();
}, utils.reject("Couldn't set model state", true));
},

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