FLEX/Classes/Editing/FLEXPropertyEditorViewController.m

//
//  FLEXPropertyEditorViewController.m
//  Flipboard
//
//  Created by Ryan Olson on 5/20/14.
//  Copyright (c) 2014 Flipboard. All rights reserved.
//

#import "FLEXPropertyEditorViewController.h"
#import "FLEXRuntimeUtility.h"
#import "FLEXFieldEditorView.h"
#import "FLEXArgumentInputView.h"
#import "FLEXArgumentInputViewFactory.h"
#import "FLEXArgumentInputSwitchView.h"

@interface FLEXPropertyEditorViewController () <FLEXArgumentInputViewDelegate>

@property (nonatomic) objc_property_t property;

@end

@implementation FLEXPropertyEditorViewController

- (id)initWithTarget:(id)target property:(objc_property_t)property
{
    self = [super initWithTarget:target];
    if (self) {
        self.property = property;
        self.title = @"Property";
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.fieldEditorView.fieldDescription = [FLEXRuntimeUtility fullDescriptionForProperty:self.property];
    id currentValue = [FLEXRuntimeUtility valueForProperty:self.property onObject:self.target];
    self.setterButton.enabled = [[self class] canEditProperty:self.property onObject:self.target currentValue:currentValue];
    
    const char *typeEncoding = [FLEXRuntimeUtility typeEncodingForProperty:self.property].UTF8String;
    FLEXArgumentInputView *inputView = [FLEXArgumentInputViewFactory argumentInputViewForTypeEncoding:typeEncoding];
    inputView.backgroundColor = self.view.backgroundColor;
    inputView.inputValue = [FLEXRuntimeUtility valueForProperty:self.property onObject:self.target];
    inputView.delegate = self;
    self.fieldEditorView.argumentInputViews = @[inputView];
    
    // Don't show a "set" button for switches - just call the setter immediately after the switch toggles.
    if ([inputView isKindOfClass:[FLEXArgumentInputSwitchView class]]) {
        self.navigationItem.rightBarButtonItem = nil;
    }
}

- (void)actionButtonPressed:(id)sender
{
    [super actionButtonPressed:sender];
    
    id userInputObject = self.firstInputView.inputValue;
    NSArray *arguments = userInputObject ? @[userInputObject] : nil;
    SEL setterSelector = [FLEXRuntimeUtility setterSelectorForProperty:self.property];
    NSError *error = nil;
    [FLEXRuntimeUtility performSelector:setterSelector onObject:self.target withArguments:arguments error:&error];
    if (error) {
        NSString *title = @"Property Setter Failed";
        NSString *message = [error localizedDescription];
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title message:message delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
        self.firstInputView.inputValue = [FLEXRuntimeUtility valueForProperty:self.property onObject:self.target];
    } else {
        // If the setter was called without error, pop the view controller to indicate that and make the user's life easier.
        // Don't do this for simulated taps on the action button (i.e. from switch/BOOL editors). The experience is weird there.
        if (sender) {
            [self.navigationController popViewControllerAnimated:YES];
        }
    }
}

- (void)getterButtonPressed:(id)sender
{
    [super getterButtonPressed:sender];
    id returnedObject = [FLEXRuntimeUtility valueForProperty:self.property onObject:self.target];
    [self exploreObjectOrPopViewController:returnedObject];
}

- (void)argumentInputViewValueDidChange:(FLEXArgumentInputView *)argumentInputView
{
    if ([argumentInputView isKindOfClass:[FLEXArgumentInputSwitchView class]]) {
        [self actionButtonPressed:nil];
    }
}

+ (BOOL)canEditProperty:(objc_property_t)property onObject:(id)object currentValue:(id)value
{
    const char *typeEncoding = [FLEXRuntimeUtility typeEncodingForProperty:property].UTF8String;
    BOOL canEditType = [FLEXArgumentInputViewFactory canEditFieldWithTypeEncoding:typeEncoding currentValue:value];
    SEL setterSelector = [FLEXRuntimeUtility setterSelectorForProperty:property];
    BOOL isReadonly = [FLEXRuntimeUtility isReadonlyProperty:property] && (!setterSelector || ![object respondsToSelector:setterSelector]);
    return canEditType && !isReadonly;
}

@end