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https://github.com/opencv/opencv.git
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316 lines
11 KiB
C++
316 lines
11 KiB
C++
//*********************************************************
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//
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// Copyright (c) Microsoft. All rights reserved.
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// THIS CODE IS PROVIDED *AS IS* WITHOUT WARRANTY OF
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// ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING ANY
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// IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR
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// PURPOSE, MERCHANTABILITY, OR NON-INFRINGEMENT.
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//
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//*********************************************************
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//
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// MainPage.xaml.cpp
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// Implementation of the MainPage.xaml class.
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//
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#include "pch.h"
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#include "MainPage.xaml.h"
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#include "App.xaml.h"
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#include <collection.h>
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using namespace Windows::UI::Xaml;
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using namespace Windows::UI::Xaml::Controls;
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using namespace Windows::Foundation;
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using namespace Windows::Foundation::Collections;
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using namespace Platform;
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using namespace SDKSample;
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using namespace Windows::UI::Xaml::Navigation;
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using namespace Windows::UI::Xaml::Interop;
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using namespace Windows::Graphics::Display;
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using namespace Windows::UI::ViewManagement;
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MainPage^ MainPage::Current = nullptr;
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MainPage::MainPage()
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{
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InitializeComponent();
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// This frame is hidden, meaning it is never shown. It is simply used to load
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// each scenario page and then pluck out the input and output sections and
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// place them into the UserControls on the main page.
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HiddenFrame = ref new Windows::UI::Xaml::Controls::Frame();
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HiddenFrame->Visibility = Windows::UI::Xaml::Visibility::Collapsed;
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ContentRoot->Children->Append(HiddenFrame);
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FeatureName->Text = FEATURE_NAME;
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this->SizeChanged += ref new SizeChangedEventHandler(this, &MainPage::MainPage_SizeChanged);
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Scenarios->SelectionChanged += ref new SelectionChangedEventHandler(this, &MainPage::Scenarios_SelectionChanged);
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MainPage::Current = this;
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autoSizeInputSectionWhenSnapped = true;
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}
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/// <summary>
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/// We need to handle SizeChanged so that we can make the sample layout property
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/// in the various layouts.
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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void MainPage::MainPage_SizeChanged(Object^ sender, SizeChangedEventArgs^ e)
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{
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InvalidateSize();
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MainPageSizeChangedEventArgs^ args = ref new MainPageSizeChangedEventArgs();
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args->ViewState = ApplicationView::Value;
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MainPageResized(this, args);
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}
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void MainPage::InvalidateSize()
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{
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// Get the window width
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double windowWidth = this->ActualWidth;
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if (windowWidth != 0.0)
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{
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// Get the width of the ListBox.
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double listBoxWidth = Scenarios->ActualWidth;
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// Is the ListBox using any margins that we need to consider?
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double listBoxMarginLeft = Scenarios->Margin.Left;
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double listBoxMarginRight = Scenarios->Margin.Right;
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// Figure out how much room is left after considering the list box width
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double availableWidth = windowWidth - listBoxWidth;
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// Is the top most child using margins?
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double layoutRootMarginLeft = ContentRoot->Margin.Left;
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double layoutRootMarginRight = ContentRoot->Margin.Right;
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// We have different widths to use depending on the view state
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if (ApplicationView::Value != ApplicationViewState::Snapped)
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{
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// Make us as big as the the left over space, factoring in the ListBox width, the ListBox margins.
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// and the LayoutRoot's margins
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InputSection->Width = ((availableWidth) -
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(layoutRootMarginLeft + layoutRootMarginRight + listBoxMarginLeft + listBoxMarginRight));
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}
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else
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{
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// Make us as big as the left over space, factoring in just the LayoutRoot's margins.
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if (autoSizeInputSectionWhenSnapped)
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{
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InputSection->Width = (windowWidth - (layoutRootMarginLeft + layoutRootMarginRight));
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}
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}
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}
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InvalidateViewState();
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}
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void MainPage::InvalidateViewState()
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{
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// Are we going to snapped mode?
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if (ApplicationView::Value == ApplicationViewState::Snapped)
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{
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Grid::SetRow(DescriptionText, 3);
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Grid::SetColumn(DescriptionText, 0);
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Grid::SetRow(InputSection, 4);
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Grid::SetColumn(InputSection, 0);
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Grid::SetRow(FooterPanel, 2);
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Grid::SetColumn(FooterPanel, 0);
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}
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else
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{
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Grid::SetRow(DescriptionText, 1);
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Grid::SetColumn(DescriptionText, 1);
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Grid::SetRow(InputSection, 2);
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Grid::SetColumn(InputSection, 1);
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Grid::SetRow(FooterPanel, 1);
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Grid::SetColumn(FooterPanel, 1);
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}
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// Since we don't load the scenario page in the traditional manner (we just pluck out the
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// input and output sections from the page) we need to ensure that any VSM code used
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// by the scenario's input and output sections is fired.
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VisualStateManager::GoToState(InputSection, "Input" + LayoutAwarePage::DetermineVisualState(ApplicationView::Value), false);
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VisualStateManager::GoToState(OutputSection, "Output" + LayoutAwarePage::DetermineVisualState(ApplicationView::Value), false);
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}
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void MainPage::PopulateScenarios()
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{
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ScenarioList = ref new Platform::Collections::Vector<Object^>();
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// Populate the ListBox with the list of scenarios as defined in Constants.cpp.
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for (unsigned int i = 0; i < scenarios->Length; ++i)
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{
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Scenario s = scenarios[i];
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ListBoxItem^ item = ref new ListBoxItem();
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item->Name = s.ClassName;
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item->Content = (i + 1).ToString() + ") " + s.Title;
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ScenarioList->Append(item);
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}
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// Bind the ListBox to the scenario list.
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Scenarios->ItemsSource = ScenarioList;
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Scenarios->ScrollIntoView(Scenarios->SelectedItem);
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}
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/// <summary>
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/// This method is responsible for loading the individual input and output sections for each scenario. This
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/// is based on navigating a hidden Frame to the ScenarioX.xaml page and then extracting out the input
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/// and output sections into the respective UserControl on the main page.
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/// </summary>
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/// <param name="scenarioName"></param>
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void MainPage::LoadScenario(String^ scenarioName)
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{
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autoSizeInputSectionWhenSnapped = true;
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// Load the ScenarioX.xaml file into the Frame.
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TypeName scenarioType = {scenarioName, TypeKind::Custom};
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HiddenFrame->Navigate(scenarioType, this);
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// Get the top element, the Page, so we can look up the elements
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// that represent the input and output sections of the ScenarioX file.
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Page^ hiddenPage = safe_cast<Page^>(HiddenFrame->Content);
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// Get each element.
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UIElement^ input = safe_cast<UIElement^>(hiddenPage->FindName("Input"));
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UIElement^ output = safe_cast<UIElement^>(hiddenPage->FindName("Output"));
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if (input == nullptr)
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{
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// Malformed input section.
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NotifyUser("Cannot load scenario input section for " + scenarioName +
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" Make sure root of input section markup has x:Name of 'Input'", NotifyType::ErrorMessage);
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return;
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}
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if (output == nullptr)
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{
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// Malformed output section.
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NotifyUser("Cannot load scenario output section for " + scenarioName +
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" Make sure root of output section markup has x:Name of 'Output'", NotifyType::ErrorMessage);
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return;
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}
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// Find the LayoutRoot which parents the input and output sections in the main page.
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Panel^ panel = safe_cast<Panel^>(hiddenPage->FindName("LayoutRoot"));
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if (panel != nullptr)
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{
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unsigned int index = 0;
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UIElementCollection^ collection = panel->Children;
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// Get rid of the content that is currently in the intput and output sections.
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collection->IndexOf(input, &index);
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collection->RemoveAt(index);
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collection->IndexOf(output, &index);
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collection->RemoveAt(index);
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// Populate the input and output sections with the newly loaded content.
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InputSection->Content = input;
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OutputSection->Content = output;
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ScenarioLoaded(this, nullptr);
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}
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else
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{
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// Malformed Scenario file.
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NotifyUser("Cannot load scenario: " + scenarioName + ". Make sure root tag in the '" +
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scenarioName + "' file has an x:Name of 'LayoutRoot'", NotifyType::ErrorMessage);
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}
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}
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void MainPage::Scenarios_SelectionChanged(Object^ sender, SelectionChangedEventArgs^ e)
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{
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if (Scenarios->SelectedItem != nullptr)
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{
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NotifyUser("", NotifyType::StatusMessage);
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LoadScenario((safe_cast<ListBoxItem^>(Scenarios->SelectedItem))->Name);
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InvalidateSize();
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}
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}
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void MainPage::NotifyUser(String^ strMessage, NotifyType type)
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{
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switch (type)
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{
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case NotifyType::StatusMessage:
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// Use the status message style.
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StatusBlock->Style = safe_cast<Windows::UI::Xaml::Style^>(this->Resources->Lookup("StatusStyle"));
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break;
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case NotifyType::ErrorMessage:
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// Use the error message style.
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StatusBlock->Style = safe_cast<Windows::UI::Xaml::Style^>(this->Resources->Lookup("ErrorStyle"));
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break;
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default:
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break;
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}
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StatusBlock->Text = strMessage;
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// Collapsed the StatusBlock if it has no text to conserve real estate.
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if (StatusBlock->Text != "")
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{
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StatusBlock->Visibility = Windows::UI::Xaml::Visibility::Visible;
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}
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else
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{
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StatusBlock->Visibility = Windows::UI::Xaml::Visibility::Collapsed;
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}
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}
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void MainPage::Footer_Click(Object^ sender, RoutedEventArgs^ e)
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{
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auto uri = ref new Uri((String^)((HyperlinkButton^)sender)->Tag);
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Windows::System::Launcher::LaunchUriAsync(uri);
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}
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/// <summary>
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/// Populates the page with content passed during navigation. Any saved state is also
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/// provided when recreating a page from a prior session.
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/// </summary>
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/// <param name="navigationParameter">The parameter value passed to
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/// <see cref="Frame::Navigate(Type, Object)"/> when this page was initially requested.
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/// </param>
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/// <param name="pageState">A map of state preserved by this page during an earlier
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/// session. This will be null the first time a page is visited.</param>
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void MainPage::LoadState(Object^ navigationParameter, IMap<String^, Object^>^ pageState)
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{
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(void) navigationParameter; // Unused parameter
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PopulateScenarios();
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// Starting scenario is the first or based upon a previous state.
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ListBoxItem^ startingScenario = nullptr;
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int startingScenarioIndex = -1;
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if (pageState != nullptr && pageState->HasKey("SelectedScenarioIndex"))
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{
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startingScenarioIndex = safe_cast<int>(pageState->Lookup("SelectedScenarioIndex"));
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}
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Scenarios->SelectedIndex = startingScenarioIndex != -1 ? startingScenarioIndex : 0;
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InvalidateViewState();
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}
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/// <summary>
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/// Preserves state associated with this page in case the application is suspended or the
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/// page is discarded from the navigation cache. Values must conform to the serialization
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/// requirements of <see cref="SuspensionManager::SessionState"/>.
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/// </summary>
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/// <param name="pageState">An empty map to be populated with serializable state.</param>
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void MainPage::SaveState(IMap<String^, Object^>^ pageState)
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{
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int selectedListBoxItemIndex = Scenarios->SelectedIndex;
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pageState->Insert("SelectedScenarioIndex", selectedListBoxItemIndex);
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}
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