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f32135e2c7
This turns out to be really important. Otherwise the modal dialog doesn't stay on top of the application's window stack, which can make things awkward when ShowInTaskbar is set to false. The easiest way to ensure this is getting done is to make it part of the constructor arguments. The code now passes the parent window in explicitly. WPF MessageBox avoids this by calling UnsafeNativeMethods.GetActiveWindow(), but that feels weird. We could assume Application.Current.MainWindow is the parent, but that seems like it could go quietly and horribly wrong.
119 lines
4.3 KiB
C#
119 lines
4.3 KiB
C#
/*
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* Copyright 2019 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.Diagnostics;
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using System.Windows;
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using System.Windows.Controls;
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namespace SourceGenWPF.ProjWin {
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/// <summary>
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/// Edit Address dialog.
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/// </summary>
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public partial class EditAddress : Window {
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/// <summary>
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/// Address typed by user. Only valid after the dialog returns OK. Will be set to -1
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/// if the user is attempting to delete the address.
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/// </summary>
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public int Address { get; private set; }
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/// <summary>
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/// Maximum allowed address value.
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/// </summary>
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private int mMaxAddressValue;
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/// <summary>
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/// Bound two-way property.
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/// </summary>
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public string AddressText { get; set; }
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public EditAddress(Window owner, int initialAddr, int maxAddressValue) {
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// Set the property before initializing the window -- we don't have a property
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// change notifier.
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Address = -2;
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mMaxAddressValue = maxAddressValue;
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AddressText = Asm65.Address.AddressToString(initialAddr, false);
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this.DataContext = this;
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InitializeComponent();
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Owner = owner;
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}
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private void OkButton_Click(object sender, RoutedEventArgs e) {
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if (AddressText.Length == 0) {
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Address = -1;
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} else {
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Asm65.Address.ParseAddress(AddressText, mMaxAddressValue, out int addr);
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Address = addr;
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}
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DialogResult = true;
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}
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/// <summary>
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/// Handles a TextChanged event on the address text box.
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/// </summary>
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/// <remarks>
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/// Must have UpdateSourceTrigger=PropertyChanged set for this to work. The default
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/// for TextBox is LostFocus.
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/// </remarks>
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private void TextBox_TextChanged(object sender, TextChangedEventArgs e) {
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if (IsLoaded) {
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UpdateOkEnabled();
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}
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}
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private void UpdateOkEnabled() {
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string text = AddressText;
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okButton.IsEnabled = (text.Length == 0) ||
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Asm65.Address.ParseAddress(text, mMaxAddressValue, out int unused);
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}
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private void Window_Loaded(object sender, RoutedEventArgs e) {
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addrTextBox.SelectAll();
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addrTextBox.Focus();
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}
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}
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// I briefly played with the validation rules. However, they're primarily designed for
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// form entry, which means they fire when focus leaves the text box. [note: not sure if
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// this would change with UpdateSourceTrigger=PropertyChanged] I want the OK button to be
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// kept constantly up to date as the user types, so this didn't really work. It's also a
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// lot bigger and uglier than just handling an event.
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//
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// It's also sort of awkward to pass parameters, like MaxAddressValue, into the
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// validation rule.
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// https://social.technet.microsoft.com/wiki/contents/articles/31422.wpf-passing-a-data-bound-value-to-a-validation-rule.aspx
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//
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// Speaking of awkward, updating the OK button enable/disable through validation
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// is possible via MultiDataTrigger.
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//public class AddressValidationRule : ValidationRule {
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// public int MaxAddress { get; set; }
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// public override ValidationResult Validate(object value, CultureInfo cultureInfo) {
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// string text = value.ToString();
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// Debug.WriteLine("VALIDATE " + text);
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// if ((text.Length == 0) ||
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// Asm65.Address.ParseAddress(text, MaxAddress, out int unused)) {
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// return new ValidationResult(true, null);
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// } else {
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// return new ValidationResult(false, "Invalid address");
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// }
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// }
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//}
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} |