Add thumbnail strip widget to manage sizing and layout of thumb previews

2026-08-23 15:06:32 +00:00 · 2016-10-04 19:54:28 +02:00
parent 7bb9c36de4
commit 2577218e32
9 changed files with 331 additions and 102 deletions
@@ -0,0 +1,147 @@
+#include "ThumbnailStrip.h"
+#include <QDebug>
+#include <QScrollBar>
+#include "Widgets/ResourcePreview.h"
+#include "ui_ThumbnailStrip.h"
+
+ThumbnailStrip::ThumbnailStrip(QWidget *parent) : QWidget(parent), ui(new Ui::ThumbnailStrip)
+{
+  ui->setupUi(this);
+
+  layout = new QVBoxLayout(ui->scrollAreaWidgetContents);
+  layout->setSpacing(6);
+  layout->setContentsMargins(6, 6, 6, 6);
+  layout->setAlignment(Qt::AlignTop);
+}
+
+ThumbnailStrip::~ThumbnailStrip()
+{
+  delete layout;
+  delete ui;
+}
+
+void ThumbnailStrip::AddPreview(ResourcePreview *prev)
+{
+  layout->addWidget(prev);
+  m_Thumbnails.push_back(prev);
+}
+
+void ThumbnailStrip::ClearThumbnails()
+{
+  for(ResourcePreview *p : m_Thumbnails)
+  {
+    layout->removeWidget(p);
+    delete p;
+  }
+
+  m_Thumbnails.clear();
+}
+
+void ThumbnailStrip::resizeEvent(QResizeEvent *event)
+{
+  RefreshLayout();
+}
+
+void ThumbnailStrip::mousePressEvent(QMouseEvent *event)
+{
+  emit(mouseClick(event));
+}
+
+void ThumbnailStrip::RefreshLayout()
+{
+  QRect avail = geometry();
+  avail.adjust(6, 6, -6, -6);
+
+  int numActive = 0;
+  for(ResourcePreview *c : m_Thumbnails)
+    if(c->isActive())
+      numActive++;
+
+  // depending on overall aspect ratio, we either lay out the strip horizontally or
+  // vertically. This tries to account for whether the strip is docked along one side
+  // or another of the texture viewer
+  if(avail.width() > avail.height())
+  {
+    avail.setWidth(avail.width() + 6);    // controls implicitly have a 6 margin on the right
+
+    int aspectWidth = (int)((float)avail.height() * 1.3f);
+
+    ui->scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+
+    delete layout;
+    layout = new QHBoxLayout(ui->scrollAreaWidgetContents);
+    for(ResourcePreview *w : m_Thumbnails)
+      layout->addWidget(w);
+    layout->setSpacing(6);
+    layout->setContentsMargins(6, 6, 6, 6);
+    layout->setAlignment(Qt::AlignTop);
+
+    int noscrollWidth = numActive * (aspectWidth + 20);
+
+    if(noscrollWidth <= avail.width())
+    {
+      ui->scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+
+      for(ResourcePreview *c : m_Thumbnails)
+        c->SetSize(QSize(aspectWidth, avail.height()));
+    }
+    else
+    {
+      ui->scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
+
+      QScrollBar *hs = ui->scrollArea->horizontalScrollBar();
+
+      avail.setHeight(avail.height() - hs->geometry().height());
+
+      aspectWidth = (int)((float)avail.height() * 1.3f);
+
+      int totalWidth = numActive * (aspectWidth + 20);
+      hs->setEnabled(totalWidth > avail.width());
+
+      for(ResourcePreview *c : m_Thumbnails)
+        c->SetSize(QSize(aspectWidth, avail.height()));
+    }
+  }
+  else
+  {
+    avail.setHeight(avail.height() + 6);    // controls implicitly have a 6 margin on the bottom
+
+    int aspectHeight = (int)((float)avail.width() / 1.3f);
+
+    ui->scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+
+    delete layout;
+    layout = new QVBoxLayout(ui->scrollAreaWidgetContents);
+    for(ResourcePreview *w : m_Thumbnails)
+      layout->addWidget(w);
+    layout->setSpacing(6);
+    layout->setContentsMargins(6, 6, 6, 6);
+    layout->setAlignment(Qt::AlignTop);
+
+    int noscrollHeight = numActive * (aspectHeight + 6);
+
+    if(noscrollHeight <= avail.height())
+    {
+      ui->scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+
+      for(ResourcePreview *c : m_Thumbnails)
+        c->SetSize(QSize(avail.width(), aspectHeight));
+    }
+    else
+    {
+      ui->scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
+
+      QScrollBar *vs = ui->scrollArea->verticalScrollBar();
+
+      avail.setWidth(avail.width() - vs->geometry().width());
+
+      aspectHeight = (int)((float)avail.width() / 1.3f);
+
+      int totalHeight = numActive * (aspectHeight + 6);
+      vs->setEnabled(totalHeight > avail.height());
+
+      for(ResourcePreview *c : m_Thumbnails)
+        c->SetSize(QSize(avail.width(), aspectHeight));
+    }
+  }
+}