show method

Future<T?> show(BuildContext context)

Displays the dialog and returns the selected item.

If loadingDialog is provided, it will be displayed while fetching items. Returns null if no item is selected or fetching items fails.

Implementation

Future<T?> show(BuildContext context) async {
  LoadingDialog loadingDialog = this.loadingDialog ??
      LoadingDialog(message: loadingMessage ?? 'Fetching Data');

  loadingDialog.show(context);

  List<T>? items = await asyncItems.call();
  if (context.mounted) loadingDialog.dismiss(context);

  if (context.mounted && items != null) {
    Size screenSize = MediaQuery.of(context).size;
    bool isPortrait =
        MediaQuery.of(context).orientation == Orientation.portrait;
    return await showDialog<T>(
      context: context,
      barrierDismissible: barrierDismissible,
      builder: (context) {
        return Center(
          child: Material(
            elevation: elevation,
            borderRadius: BorderRadius.circular(dialogBorderRadius),
            child: ConstrainedBox(
              constraints: BoxConstraints(
                maxWidth: dialogWidth ??
                    (isPortrait ? screenSize.width : screenSize.height) *
                        0.85,
                minWidth: dialogWidth ??
                    (isPortrait ? screenSize.width : screenSize.height) *
                        0.85,
                maxHeight: dialogHeight ??
                    (isPortrait ? screenSize.height : screenSize.width) *
                        0.85,
              ),
              child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  if (title != null || titleWidget != null || showCloseIcon)
                    titleWidget ??
                        Container(
                          height: titleHeight,
                          padding: EdgeInsets.only(
                            left: showCloseIcon ? 2.0 : 20.0,
                            right: 20.0,
                          ),
                          decoration: BoxDecoration(
                            color: titleBackgroundColor ??
                                Theme.of(context).colorScheme.primary,
                            borderRadius: BorderRadius.only(
                              topLeft: Radius.circular(dialogBorderRadius),
                              topRight: Radius.circular(dialogBorderRadius),
                            ),
                          ),
                          alignment: Alignment.centerLeft,
                          child: Row(
                            children: [
                              if (showCloseIcon)
                                IconButton(
                                  onPressed: () =>
                                      Navigator.of(context).pop(),
                                  icon: const Icon(
                                    Icons.clear,
                                    color: Colors.white,
                                  ),
                                ),
                              if (showCloseIcon) const SizedBox(width: 5.0),
                              if (title != null)
                                Expanded(
                                  child: Text(
                                    title!,
                                    style: titleStyle ??
                                        Theme.of(context)
                                            .textTheme
                                            .headlineMedium
                                            ?.copyWith(
                                              color: Colors.white,
                                            ),
                                  ),
                                ),
                            ],
                          ),
                        ),
                  Flexible(
                    fit: FlexFit.loose,
                    child: ListView.builder(
                      shrinkWrap: true,
                      itemCount: items.length,
                      itemBuilder: (context, index) {
                        return Padding(
                          padding: const EdgeInsets.symmetric(
                              horizontal: 20.0, vertical: 3.0),
                          child: InkWell(
                            borderRadius: BorderRadius.circular(8.0),
                            onTap: () =>
                                Navigator.of(context).pop(items[index]),
                            child: Container(
                              width: double.infinity,
                              padding: const EdgeInsets.symmetric(
                                  horizontal: 10.0),
                              child: itemBuilder.call(
                                  context, items[index], index),
                            ),
                          ),
                        );
                      },
                    ),
                  ),
                  if (dialogButton?.positiveButton != null ||
                      dialogButton?.negativeButton != null)
                    Padding(
                      padding: const EdgeInsets.all(20.0),
                      child: Row(
                        mainAxisAlignment: MainAxisAlignment.end,
                        children: [
                          if (dialogButton!.negativeButton != null)
                            Flexible(
                              fit: FlexFit.loose,
                              child: InkWell(
                                onTap:
                                    dialogButton!.onNegativeButtonPressed ??
                                        () => Navigator.of(context).pop(),
                                child: dialogButton!.negativeButton!,
                              ),
                            ),
                          const SizedBox(width: 10.0),
                          if (dialogButton!.positiveButton != null)
                            Flexible(
                              fit: FlexFit.loose,
                              child: InkWell(
                                onTap:
                                    dialogButton!.onPositiveButtonPressed ??
                                        () => Navigator.of(context).pop(),
                                child: dialogButton!.positiveButton!,
                              ),
                            ),
                        ],
                      ),
                    ),
                ],
              ),
            ),
          ),
        );
      },
    );
  }
  return null;
}