+++ /dev/null
-//
-// Bindings.cs
-//
-// Author:
-// Jean-Philippe Bruyère <jp_bruyere@hotmail.com>
-//
-// Copyright (c) 2016 jp
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program. If not, see <http://www.gnu.org/licenses/>.
-using System;
-using System.Diagnostics;
-
-namespace Crow
-{
- /// <summary>
- /// Binding Class
- /// </summary>
- public class Binding
- {
- static int bindingCpt;
- string dynMethodId = "";
- bool resolved;
-
- public bool TwoWayBinding;
- public MemberReference Source;
- public MemberReference Target;
-
- public string Expression;
-
- public string DynMethodId {
- get { return dynMethodId; }
- }
- public Type SourceType {
- get { return Source == null ? null
- : Source.Instance == null ? null
- : Source.Instance.GetType();}
- }
-
- public bool Resolved {
- get { return resolved; }
- set {
- if (value == resolved)
- return;
-#if DEBUG_BINDING
- if (value == true)
- Debug.WriteLine ("\tOk => " + this.ToString());
- else
- Debug.WriteLine ("\tresolved state reseted => " + this.ToString());
-#endif
- resolved = value;
- }
- }
-
- #region CTOR
- public Binding () { }
- public Binding (MemberReference _source, string _expression)
- {
- Source = _source;
- Expression = _expression;
- }
- public Binding (object _source, string _member, string _expression)
- {
- Source = new MemberReference (_source, _source.GetType ().GetMember (_member) [0]);
- Expression = _expression;
- }
- public Binding (object _source, string _sourceMember, object _target, string _targetMember)
- {
- Source = new MemberReference (_source, _source.GetType ().GetMember (_sourceMember) [0]);
- Target = new MemberReference (_target, _target.GetType ().GetMember (_targetMember) [0]);
- }
- public Binding (MemberReference _source, MemberReference _target)
- {
- Source = _source;
- Target = _target;
- }
- #endregion
-
- public string CreateNewDynMethodId ()
- {
- if (!string.IsNullOrEmpty (dynMethodId))
- return dynMethodId;
- dynMethodId = "dynHandle_" + bindingCpt;
- bindingCpt++;
- return dynMethodId;
- }
- /// <summary>
- /// resolve target expression
- /// </summary>
- /// <returns><c>true</c>, if target was found, <c>false</c> otherwise.</returns>
- public bool TryFindTarget ()
- {
- if (Target != null)
- return true;
-
- string memberName = null;
-
- //if binding exp = '{}' => binding is done on datasource
- if (string.IsNullOrEmpty (Expression)) {
- Object o = (Source.Instance as GraphicObject).DataSource;
- if (o == null)
- return false;
- Target = new MemberReference (o);
- return true;
- }
-
- string expression = Expression;
-
- if (expression.StartsWith ("²")) {
- expression = expression.Substring (1);
- TwoWayBinding = true;
- }
-
- string [] bindingExp = expression.Split ('/');
-
-
- if (bindingExp.Length == 1) {
- //datasource binding
- object dataSource = (Source.Instance as GraphicObject).DataSource;
- if (dataSource == null) {
- #if DEBUG_BINDING
- Debug.WriteLine ("\tDataSource is null => " + this.ToString());
- #endif
- return false;
- }
-
- Target = new MemberReference (dataSource);
- memberName = bindingExp [0];
- } else {
- int ptr = 0;
- ILayoutable tmpTarget = Source.Instance as ILayoutable;
- //if exp start with '/' => Graphic tree parsing start at source
- if (string.IsNullOrEmpty (bindingExp [0]))
- ptr++;
- else if (bindingExp[0] == "."){ //search template root
- do {
- tmpTarget = tmpTarget.Parent;
- if (tmpTarget == null)
- return false;
- if (tmpTarget is Interface)
- throw new Exception ("Not in Templated Control");
- } while (!(tmpTarget is TemplatedControl));
- ptr++;
- }
- while (ptr < bindingExp.Length - 1) {
- if (tmpTarget == null) {
-#if DEBUG_BINDING
- Debug.WriteLine ("\tTarget not found => " + this.ToString());
-#endif
- return false;
- }
- if (bindingExp [ptr] == "..")
- tmpTarget = tmpTarget.LogicalParent;
- else if (bindingExp [ptr] == ".") {
- if (ptr > 0)
- throw new Exception ("Syntax error in binding, './' may only appear in first position");
- tmpTarget = Source.Instance as ILayoutable;
- } else
- tmpTarget = (tmpTarget as GraphicObject).FindByName (bindingExp [ptr]);
- ptr++;
- }
-
- if (tmpTarget == null) {
- #if DEBUG_BINDING
- Debug.WriteLine ("\tBinding Target not found => " + this.ToString());
- #endif
- return false;
- }
-
- string [] bindTrg = bindingExp [ptr].Split ('.');
-
- if (bindTrg.Length == 1)
- memberName = bindTrg [0];
- else if (bindTrg.Length == 2) {
- tmpTarget = (tmpTarget as GraphicObject).FindByName (bindTrg [0]);
- memberName = bindTrg [1];
- } else
- throw new Exception ("Syntax error in binding, expected 'go dot member'");
-
- if (tmpTarget == null) {
- #if DEBUG_BINDING
- Debug.WriteLine ("\tBinding Target not found => " + this.ToString());
- #endif
- return false;
- }
-
- Target = new MemberReference (tmpTarget);
- }
-
- if (Target.TryFindMember (memberName)) {
- if (TwoWayBinding) {
-// IBindable source = Target.Instance as IBindable;
-// if (source == null)
-// throw new Exception (Source.Instance + " does not implement IBindable for 2 way bindings");
-// source.Bindings.Add (new Binding (Target, Source));
- }
- }
- #if DEBUG_BINDING
- else
- Debug.WriteLine ("Property less binding: " + Target + expression);
- #endif
-
- return true;
- }
- public void Reset ()
- {
- Target = null;
- dynMethodId = "";
- Resolved = false;
- }
- public override string ToString ()
- {
- return string.Format ("[Binding: {0}.{1} <= {2}]", Source.Instance, Source.Member.Name, Expression);
- }
- }
-
-}
-
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