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Every once in a while, SourceGen will become unresponsive when it tries to show a MessageBox. In the debugger you can see the GC running frantically, but the stack trace is just sitting on the MessageBox show call. Apparently, if you don't specify a parent window argument, the MessageBox will occasionally end up behind everything else, and you can get stuck. I'm not sure what the GC frenzy is about, or whether this will fix what I'm seeing, but it's easy to do and might solve the problem. cf. https://stackoverflow.com/q/3467403/294248
125 lines
4.8 KiB
C#
125 lines
4.8 KiB
C#
/*
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* Copyright 2018 faddenSoft
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Diagnostics;
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using System.Windows.Forms;
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namespace SourceGen.AsmGen {
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/// <summary>
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/// Dialog that shows the progress of the assembler, and allows cancellation.
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/// </summary>
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public partial class GeneratorProgress : Form {
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/// <summary>
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/// Full pathnames of generated files. Will be null on error or user cancelation.
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/// </summary>
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public List<string> Results { get; private set; }
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private IGenerator mGenerator;
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/// <summary>
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/// Constructor.
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/// </summary>
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/// <param name="gen">Fully-configured source generator.</param>
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public GeneratorProgress(IGenerator gen) {
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InitializeComponent();
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mGenerator = gen;
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}
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private void GeneratorProgress_Load(object sender, EventArgs e) {
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backgroundWorker1.RunWorkerAsync();
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}
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private void cancelButton_Click(object sender, EventArgs e) {
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backgroundWorker1.CancelAsync();
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cancelButton.Enabled = false;
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}
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private void GeneratorProgress_FormClosing(object sender, FormClosingEventArgs e) {
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// The close button will close the dialog without canceling the event. We
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// cancel it here, which should cause it to stop relatively quickly, but we don't
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// wait for it on the off chance that something weird is going on and it got
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// stuck. If nothing else, this gives the user a chance to save their work.
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if (backgroundWorker1.IsBusy) {
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backgroundWorker1.CancelAsync();
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DialogResult = DialogResult.Cancel;
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}
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}
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// NOTE: executes on work thread. DO NOT do any UI work here. DO NOT access
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// the Results property directly.
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private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) {
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BackgroundWorker worker = sender as BackgroundWorker;
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// This will throw an I/O exception if there's a problem with the file. This
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// will be caught and transferred to RunWorkerCompleted.
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List<string> fileNames = mGenerator.GenerateSource(worker);
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if (worker.CancellationPending) {
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e.Cancel = true;
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} else {
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e.Result = fileNames;
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}
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}
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// Callback that fires when a progress update is made.
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private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e) {
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int percent = e.ProgressPercentage;
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string msg = e.UserState as string;
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Debug.Assert(percent >= 0 && percent <= 100);
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if (!string.IsNullOrEmpty(msg)) {
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progressLabel.Text = msg;
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}
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progressBar1.Value = percent;
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}
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// Callback that fires when execution completes.
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private void backgroundWorker1_RunWorkerCompleted(object sender,
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RunWorkerCompletedEventArgs e) {
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if (e.Cancelled) {
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Debug.WriteLine("CANCELED");
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DialogResult = DialogResult.Cancel;
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} else if (e.Error != null) {
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// This should only happen on a file I/O error, e.g. out of disk space or
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// unable to overwrite an existing file.
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MessageBox.Show(this, e.Error.ToString(), Properties.Resources.OPERATION_FAILED,
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MessageBoxButtons.OK, MessageBoxIcon.Error);
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DialogResult = DialogResult.Cancel;
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} else {
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// Make results available in property.
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Results = e.Result as List<string>;
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if (Results == null || Results.Count == 0) {
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// Shouldn't happen -- generator should have reported error.
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MessageBox.Show(this, "Internal error: no files generated",
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Properties.Resources.OPERATION_FAILED,
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MessageBoxButtons.OK, MessageBoxIcon.Error);
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} else {
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Debug.WriteLine("SUCCESS " + Results.Count);
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}
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DialogResult = DialogResult.OK;
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}
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// Whatever the case, we're done.
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this.Close();
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}
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}
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}
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