ui/winui/list.cpp

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2023 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
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#include "list.h"
#include "container.h"
#include "util.h"

#include "../common/context.h"
#include "../common/object.h"

#include <winrt/Microsoft.UI.Xaml.Data.h>

using namespace winrt;
using namespace Microsoft::UI::Xaml;
using namespace Microsoft::UI::Xaml::Controls;
using namespace Windows::UI::Xaml::Interop;
using namespace winrt::Windows::Foundation;
using namespace winrt::Microsoft::UI::Xaml::Controls::Primitives;

UIWIDGET ui_listview_create(UiObject* obj, UiListArgs args) {
    UiObject* current = uic_current_obj(obj);

    // create listview and toolkit wrapper
    ListView listview = ListView();
    if (args.multiselection) {
        listview.SelectionMode(ListViewSelectionMode::Extended);
    }

    bool clickEnabled = listview.IsItemClickEnabled();
    listview.IsItemClickEnabled(true);
    

    UIElement elm = listview;
    UiWidget* widget = new UiWidget(elm);
    widget->data1 = args.model;
    widget->data2 = args.getvalue;
    ui_context_add_widget_destructor(current->ctx, widget);

    // bind var
    UiVar* var = uic_widget_var(obj->ctx, current->ctx, args.list, args.varname, UI_VAR_LIST);
    if (var) {
        UiList* list = (UiList*)var->value;
        list->update = ui_simple_list_update;
        list->obj = widget;
        ui_simple_list_update(list, 0);
    }

    if (args.onselection) {
        ui_callback onselection = args.onselection;
        void* cbdata = args.onselectiondata;
        listview.SelectionChanged([onselection, cbdata, obj](IInspectable const& sender, RoutedEventArgs evtargs) {
            std::vector<int> selectedRows = ui_create_listview_selection(sender.as<ListView>());

            UiListSelection selection;
            selection.rows = selectedRows.data();
            selection.count = selectedRows.size();

            UiEvent evt;
            evt.obj = obj;
            evt.window = obj->window;
            evt.document = obj->ctx->document;
            evt.eventdata = &selection;
            evt.intval = 0;
            onselection(&evt, cbdata);
            });
    }
    if (args.onactivate) {
        ui_callback cb = args.onactivate;
        void* cbdata = args.onactivatedata;
        listview.ItemClick([cb, cbdata, obj](IInspectable const& sender, RoutedEventArgs evtargs) {
            std::vector<int> selectedRows = ui_create_listview_selection(sender.as<ListView>());
            UiListSelection selection;
            selection.rows = selectedRows.data();
            selection.count = selectedRows.size();

            UiEvent evt;
            evt.obj = obj;
            evt.window = obj->window;
            evt.document = obj->ctx->document;
            evt.eventdata = &selection;
            evt.intval = 0;
            cb(&evt, cbdata);
            });
    }

    // add listview to current container
    UI_APPLY_LAYOUT1(current, args);

    current->container->Add(listview, false);

    return widget;
}

static void* getstrvalue(void* elm, int ignore) {
    return elm;
}

void ui_simple_list_update(UiList* list, int i) {
    UiWidget* widget = (UiWidget*)list->obj;
    UiModel* model = (UiModel*)widget->data1;
    ui_getvaluefunc getvalue = (ui_getvaluefunc)widget->data2;
    ListView listview = widget->uielement.as<ListView>();
    auto items = listview.Items();

    // priority: getvalue, model.getvalue, getstrvalue (fallback)
    if (getvalue == nullptr) {
        if (model && model->getvalue) {
            getvalue = model->getvalue;
        } else {
            getvalue = getstrvalue;
        }
    }

    // add list elements to listview.Items
    items.Clear();
    void* elm = list->first(list);
    while (elm) {
        char* value = (char*)getvalue(elm, 0);
        wchar_t* wstr = str2wstr(value, nullptr);
        items.Append(box_value(wstr));
        free(wstr);

        elm = list->next(list);
    }
}

std::vector<int> ui_create_listview_selection(ListView listview) {
    std::vector<int> selection;
    int p = 0;
    auto ranges = listview.SelectedRanges();
    for (auto range : ranges) {
        int begin = range.FirstIndex();
        int end = range.LastIndex();
        for (int i = begin; i <= end; i++) {
            selection.push_back(i);
        }
    }
    return selection;
}